Step-by-step solutions to hundreds of high school statistics problems

Recent questions in High school statistics

prsategazd 2021-12-11 Answered

If a data set has an even number of observations, the median

Ikunupe6v 2021-12-11 Answered

a) Calculate $S S_{\times}, S S_{y y}$ , and $S S_{x y}$ (Leave no cells blank - be certain to enter ''0'' wherever required. Round your answers to 2 decimal places.)
$\begin{array}{cc} College & Student & Weekly & Earnings & Dollars (n = 5) \\ Hourse Worked (X) & Weekly Pay (Y) & (x_{i} - \bar{x})^{2} & (y_{i} - \bar{y})^{2} & (x_{1} - \bar{x}) (y_{i} - \bar{y}) \\ 11 & 103 \\ 16 & 187 \\ 16 & 216 \\ 16 & 157 \\ 32 & 262 \\ \bar{x} & \bar{y} & S S_{x x} & S S_{y y} & S S_{x y} \end{array}$
b) )Calculate the sample correlation coefficient. Check your work by using Excel's function =CORREL(array1,array2). (Round your answer to 4 decimal places.)

namenerk 2021-12-11 Answered

There is a fire sensor system in a building. In long series of experiments, it was found that the accuracy of the fire sensor system can be described as follows:
- In the case of a fire, the sensor system will be activated with probability 0.97.
- In a night without fire, the sensor system may be activated with probability 0.01. The probability of a fire in this specific area is founded $\frac{2}{397}$ from the past data.
The fire sensor system is activated. Find the probability that there was actually a fire.

Osvaldo Apodaca 2021-12-11 Answered

Supplier delivery times. Supplier on time delivery performance is critical to enabling the buyer’s organization to meet its customer service commitments. Therefore, monitoring supplier delivery times is critical. Based on a great deal of historical data, a manufacturer of personal computers finds for one of its just-in-time suppliers that the delivery times are random and well approximated by the Normal distribution with mean 48.2 minutes and standard deviation 13.4 minutes. What is the probability that the mean time of 5 deliveries will exceed one hour?

jamessinatraaa 2021-12-11 Answered

The Truly Amazing Dudes are a group of comic acrobats. The weights (in pounds) of the ten acrobats are as follows.
146 192 174 177 159 87 178 152 144 148
(a) Find the mean and sample standard deviation of the weights. (Round your answers to one decimal place.)
mean 155.7 lbs
standard deviation ? lbs
(b) What percent of the data lies within one standard deviation of the mean? %
(c) What percent of the data lies within two standard deviations of the mean? %

interdicoxd 2021-12-11 Answered

On October 30, 2020 the Center for Disease Control (CDC) reported that the daily COVID-19 data showed there were 1.2 new infections per second and that the daily death rate was one death every 107 seconds. Answer the following questions. Show all your calculations and write a sentence about your conclusion:
A.Use the CDC data to calculate the total number of daily infections on October 30th.
B. How many deaths were reported on October 30th?

Shirley Thompson 2021-12-10 Answered

Based on historical data, your manager believes that 29% of the companys

Carla Murphy 2021-12-10 Answered

Find the mean, median, and mode of the given set of raw data. (If more than one mode exists, separate your answers with commas. If an answer does not exist, enter DNE.)
1.2 1.8 0.7 1.5 1.0 0.7 1.9 1.7 1.2
0.8 1.7 1.3 2.3 0.9 2.0 1.7 1.5 2.2
1.45
mean
median
mode

Tara Alvarado 2021-12-10 Answered

Marriage Prospects Data released by the Cense Bureau in 1986 indicated the likelihood that never married women would eventually marry. The data indicated that the older the women, the less the likelihood of marriage. Specifically, two statistics indicated that women who were 45 and never married had an 18 percent chance of marriage and women 25 years old had a 78 percent chance of marriage. Assume that linear fit to these two data points provides a sonable approximation for the function p-f(a), where p equals the probability of marriage and aequals the age of a no married woman
(a) Determine the linear function pfla
(b) Interpret the slope and p intercept

kuvitia9f 2021-12-10 Answered

Can you find two tailed test p value for given data
Sample size 14
Test statistics -2.23

Pamela Meyer 2021-12-10 Answered

A sample of 10 students scored the following grades: 15,19,17,39,11,20,18,37,31,35
Find the Median of the data set
Compute the Standard deviation.

Harold Kessler 2021-12-10 Answered

Data from the scores of the 100 Student Quantitative Methodalogy have been compiled in the frequency distribution table below:
$\begin{array}{ccc} Value of Quantitative Methodology & amount \\ 31 - 40 & 5 \\ 41 - 50 & 8 \\ 51 - 60 & 12 \\ 61 - 70 & 17 \\ 71 - 80 & 25 \\ 81 - 90 & 21 \\ 91 - 100 & 12 \\ 100 \end{array}$
Based on the data above, calculate:
a. Mean
b. Median
c. Mode

Shelia Lawrence 2021-12-10 Answered

During the first 13 weeks of the television season, the Saturday evening 8:00 P.M. to 9:00 P.M. audience proportions were recorded as ABC 29%, CBS 28% , NBC 24% , and independents 19%. A sample of 300 homes two weeks after a Saturday night schedule revision yielded the following viewing audience data: ABC 95 homes, CBS 64 homes, NBC81 homes, and independents 60 homes. Test with $a = .05$ to determine whether the viewing audience proportions changed.
Round your answers to two decimal places.
Test statistic =

Ikunupe6v 2021-12-10 Answered

The probabilities of a machine manufacturing 0, 1, 2, 3, 4 or 5 defective parts in one day are 0.75, p, 0.04, 0.025, 0.01 and 0.005 respectively. Construct a probability distribution for the data, by finding the missing probability. Also find the mean and variance.

Mary Reyes 2021-12-10 Answered

Past data indicate that the variance of measurements made on sheet metal stampings by experienced quality control inspectors is 0.18 (inch)2. Such measurements made by an inexperienced inspector could have too large a variance (perhaps because of inability to read instruments properly) or too small a variance (perhaps because unusually high or low measurements are discarded). If a new inspector measures 101 stampings with variance of 0.13 (inch)2, test at the 0.05 level of significance whether the inspector is making satisfactory measurements. Assume data is normally distributed.

Concepcion Hale 2021-12-10 Answered

A construction company is currently bidding a job overseas in country X. The chance of winning the job depends on the current election results in country X. If party A wins the election, the chance of the company winning the job is 60%; otherwise ,there is only a 20% chance that the company will win the job. On the other hand, from poll data, the probability that party A will win the election is 0.85. compute the probability of the company's success in winning the job.

tripiverded9 2021-12-09 Answered

Data was collected for 229 randomly selected 10 minute intervals. For each ten-minute interval, the number of people entering the atrium of a large mall were recorded. The data is summarized in the table below.
$\begin{array}{cc} Number of Guests & F r e q u e n c y \\ 60 - 69 & 92 \\ 70 - 79 & 93 \\ 80 - 89 & 15 \\ 90 - 99 & 19 \\ 100 - 109 & 10 \end{array}$
What is the class width for this GFDT?

Ernest Ryland 2021-12-09 Answered

These three data sets show the number of text messages sent by Jada, Diego, and Lin over 6 days as well as the mean number of text messages sent by each student per day.
Jada: mean 5
4 4 4 6 6 6
Diego: mean 6
4 5 5 6 8 8
Lin: mean 4
1 1 2 2 9 9
Compute the MAD for Jada's data set.

Paligutanhk 2021-12-09 Answered

A credit card manager wishes to determine the proportion of customer calls that result in a dissatisfied customer.
Based on some preliminary data, she estimates the percentage to be 10% $(p = 0.10)$ . A precision of 15% and confidence level of 90% are desired. What is the sample size?

stop2dance3l 2021-12-09 Answered

The Excel file Call Center Data shows that in a sample of 70 individuals, 27 had prior call center experience.
If we assume that the probability that any potential hire will also have experience with a probability of $\frac{27}{70}$ , what is the probability that among 10 potential hires, more than half of them will have experience? Define the parameter(s) for this distribution based on the data.

High school statistics questions and answers