Make fractions out of the following information, reduce, if possible, 1 foot is divided into 12 inches. Make a fraction of the distance from 0 to a-d 0 to a. = _ 0 to b. = _ 0 to c. = _ 0 to d. = _

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asked 2020-10-23

1. Find each of the requested values for a population with a mean of $? = 40$, and a standard deviation of $? = 8$ A. What is the z-score corresponding to $X = 52?$ B. What is the X value corresponding to $z = - 0.50?$ C. If all of the scores in the population are transformed into z-scores, what will be the values for the mean and standard deviation for the complete set of z-scores? D. What is the z-score corresponding to a sample mean of $M=42$ for a sample of $n = 4$ scores? E. What is the z-scores corresponding to a sample mean of $M= 42$ for a sample of $n = 6$ scores? 2. True or false: a. All normal distributions are symmetrical b. All normal distributions have a mean of 1.0 c. All normal distributions have a standard deviation of 1.0 d. The total area under the curve of all normal distributions is equal to 1 3. Interpret the location, direction, and distance (near or far) of the following zscores: $a. -2.00 b. 1.25 c. 3.50 d. -0.34$ 4. You are part of a trivia team and have tracked your team’s performance since you started playing, so you know that your scores are normally distributed with $\mu = 78$ and $\sigma = 12$. Recently, a new person joined the team, and you think the scores have gotten better. Use hypothesis testing to see if the average score has improved based on the following 8 weeks’ worth of score data: $82, 74, 62, 68, 79, 94, 90, 81, 80$. 5. You get hired as a server at a local restaurant, and the manager tells you that servers’ tips are $42 on average but vary about $$12 (\mu = 42, \sigma = 12)$. You decide to track your tips to see if you make a different amount, but because this is your first job as a server, you don’t know if you will make more or less in tips. After working 16 shifts, you find that your average nightly amount is $44.50 from tips. Test for a difference between this value and the population mean at the $\alpha = 0.05$ level of significance.

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asked 2020-11-10

For the following, write your list in increasing order, separated by commas.
a, List the first 10 multiples of 8.
b. LIst the first 10 multiples on 12.
c. Of the lists you produced in parts a. and b., list the multiples that 8 and 12 have in common.
d. From part c., what is the smallest multiple that 8 and 12 have in common.

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asked 2020-12-30

Use the technology of your choice to do the following tasks. The National Oceanic and Atmospheric Administration publishes temperature and precipitation information for cities around the world in Climates of the World. Data on average high temperature (in degrees Fahrenheit) in July and average precipitation (in inches) in July for 48 cities are on the WeissStats CD. For part (d), predict the average July precipitation of a city with an average July temperature of $\displaystyle{83}^{{\circ}}{F}$ a) Construct and interpret a scatterplot for the data. b) Decide whether finding a regression line for the data is reasonable. If so, then also do parts (c)-(f). c) Determine and interpret the regression equation. d) Make the indicated predictions. e) Compute and interpret the correlation coefficient. f) Identify potential outliers and influential observations.

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asked 2021-03-11

The following problem is solved by using factors and multiples and features the strategies of guessing and checking and making an organized list.
Problem
A factory uses machines to sort cards into piles. On one occasion a machine operator obtained the following curious result.
When a box of cards was sorted into 7 equal groups, there were 6 cards left over, when the box of cards was sorted into 5 equal groups, there were 4 left over, and when it was sorted into 3 equal groups, there were 2 left.
If the machine cannot sort more than 200 cards at a time, how many cards were in the box?

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asked 2021-02-27

Which of the following are true statements?
a:2in{1,2,3}
b:{2}in{1,2,3}
c:2sube{1,2,3}
d:{2}sube{1,2,3}
e:{2}sube{{1},{2}}
f:{2}in{{1},{2}}

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asked 2021-03-05

A new vaccine was tested to see if it could prevent the ear infections that many infants suffer from. Babies about a year old were randomly divided into two groups. One group received vaccinations, and the other did not. The following year, only 328 of 2460 vaccinated children had ear infections, compared to 508 of 2453 unvaccinated children. Complete parts a) through c) below. a) Are the conditions for inference satisfied? A. Yes. The data were generated by a randomized experiment, less than 10% of the population was sampled, the groups were independent, and there were more than 10 successes and failures in each group. B. No. It was not a random sample. C. No. The groups were not independent. D. No. More than 10% of the population was sampled.

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asked 2021-02-06

A.Which figure shows the loop that the must beused as the Ampèrean loop for finding for inside the solenoid?
B.Find , the z component of the magnetic field insidethe solenoid where Ampère's law applies. Express your answer in terms of,,,,and physical constants such as .
C.The magnetic field inside a solenoidcan be found exactly using Ampère's law only if thesolenoid is infinitely long. Otherwise, the Biot-Savart law must beused to find an exact answer. In practice, the field can bedetermined with very little error by using Ampère's law, aslong as certain conditions hold that make the field similar to thatin an infinitely long solenoid. Which of the following conditions musthold to allow you to use Ampère's law to find a goodapproximation?
Consider only locations where the distance from the ends ismany times . Consider any location inside the solenoid, as long asis much larger than for the solenoid. Consider only locations along the axis of the solenoid. Answer?
Show transcribed image text A. Which figure shows the loop that the must beused as the Amp?rean loop for finding B_z(r) for r inside the solenoid? B. Find B_z(r), the z component of the magnetic field insidethe solenoid where Amp?re's law applies. Express your answer in terms ofL,D,n,I,and physical constants such as mu_0. C. The magnetic field inside a solenoidcan be found exactly using Amp?re's law only if thesolenoid is infinitely long. Otherwise, the Biot - Savart law must beused to find an exact answer. In practice, the field can bedetermined with very little error by using Amp?re's law, aslong as certain conditions hold that make the field similar to thatin an infinitely long solenoid. Which of the following conditions musthold to allow you to use Amp?re's law to find a goodapproximation? Consider only locations where the distance from the ends ismany times D. Consider any location inside the solenoid, as long asLis much larger than Dfor the solenoid. Consider only locations along the axis of the solenoid.

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asked 2021-02-25

Give a full and correct answer Why is it important that a sample be random and representative when conducting hypothesis testing? Representative Sample vs. Random Sample: An Overview Economists and researchers seek to reduce sampling bias to near negligible levels when employing statistical analysis. Three basic characteristics in a sample reduce the chances of sampling bias and allow economists to make more confident inferences about a general population from the results obtained from the sample analysis or study: * Such samples must be representative of the chosen population studied. * They must be randomly chosen, meaning that each member of the larger population has an equal chance of being chosen. * They must be large enough so as not to skew the results. The optimal size of the sample group depends on the precise degree of confidence required for making an inference. Representative sampling and random sampling are two techniques used to help ensure data is free of bias. These sampling techniques are not mutually exclusive and, in fact, they are often used in tandem to reduce the degree of sampling error in an analysis and allow for greater confidence in making statistical inferences from the sample in regard to the larger group. Representative Sample A representative sample is a group or set chosen from a larger statistical population or group of factors or instances that adequately replicates the larger group according to whatever characteristic or quality is under study. A representative sample parallels key variables and characteristics of the large society under examination. Some examples include sex, age, education level, socioeconomic status (SES), or marital status. A larger sample size reduced sampling error and increases the likelihood that the sample accurately reflects the target population. Random Sample A random sample is a group or set chosen from a larger population or group of factors of instances in a random manner that allows for each member of the larger group to have an equal chance of being chosen. A random sample is meant to be an unbiased representation of the larger population. It is considered a fair way to select a sample from a larger population since every member of the population has an equal chance of getting selected. Special Considerations: People collecting samples need to ensure that bias is minimized. Representative sampling is one of the key methods of achieving this because such samples replicate as closely as possible elements of the larger population under study. This alone, however, is not enough to make the sampling bias negligible. Combining the random sampling technique with the representative sampling method reduces bias further because no specific member of the representative population has a greater chance of selection into the sample than any other. Summarize this article in 250 words.

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asked 2021-03-05

1. A curve is given by the following parametric equations. x = 20 cost, y = 10 sint. The parametric equations are used to represent the location of a car going around the racetrack. a) What is the cartesian equation that represents the race track the car is traveling on? b) What parametric equations would we use to make the car go 3 times faster on the same track? c) What parametric equations would we use to make the car go half as fast on the same track? d) What parametric equations and restrictions on t would we use to make the car go clockwise (reverse direction) and only half-way around on an interval of [0, 2?]? e) Convert the cartesian equation you found in part “a” into a polar equation? Plug it into Desmos to check your work. You must solve for “r”, so “r = ?”

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asked 2021-03-11

Factor $\displaystyle{f{{\left({x}\right)}}}={2}{x}^{{{3}}}+{\left(-{3}-{2}{i}\right)}{x}^{{{2}}}+{\left(-{3}-{i}\right)}{x}+{\left({2}+{i}\right)}$ into linear factors if $\displaystyle{2}+{i}$ is a zero of the function.

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Answer 1

From 0 to a., there are 3 inches so the fraction is: $\displaystyle\frac{{3}}{{12}}=\frac{{1}}{{4}}{f}{t}$
From 0 to a., there are 5 inches so the fraction is: $\displaystyle\frac{{5}}{{12}}{f}{t}$
From 0 to a., there are 8 inches so the fraction is: $\displaystyle\frac{{8}}{{12}}=\frac{{2}}{{3}}{f}{t}$
From 0 to a., there are 3 inches so the fraction is: $\displaystyle\frac{{11}}{{12}}{f}{t}$

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Make fractions out of the following information, reduce, if possible, 1 foot is divided into 12 inches. Make a fraction of the distance from 0 to a-d 0 to a. = ___ 0 to b. = ___ 0 to c. = ___ 0 to d. = ___

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Make fractions out of the following information, reduce, if possible, 1 foot is divided into 12 inches. Make a fraction of the distance from 0 to a-d 0 to a. = _ 0 to b. = _ 0 to c. = _ 0 to d. = _