 # Get help with college statistics

Recent questions in College Statistics Ava-May Nelson 2020-11-09 Answered

### State in detail under what conditions it is possible to make a causal inference from a comparison of means between two or more groups of individuals. floymdiT 2020-11-09 Answered

### Define CASE terms and concepts, including a repository, modeling tools, documentation tools, engineering tools, and construction tools CMIIh 2020-11-09 Answered

### Consider a group of 8 people. Among them, there is one pair of twins. These 8 people are taken into two different rooms, Room A and Room B, with four people to each room. If all groups of four people are equally likely, find the probability that the twins will be sent into the same room. CheemnCatelvew 2020-11-09 Answered

### A population of values has a normal distribution with $$\displaystyle\mu={154.5}$$ and $$\displaystyle\sigma={96.1}$$. You intend to draw a random sample of size $$\displaystyle{n}={134}$$. Find the probability that a sample of size $$\displaystyle{n}={134}$$ is randomly selected with a mean greater than 167. $$\displaystyle{P}{\left({M}{>}{167}\right)}=$$? Write your answers as numbers accurate to 4 decimal places. CoormaBak9 2020-11-09 Answered

### When working with bivariate data, which of these are useful when deciding whether it’s appropriate to use a linear model? I. the scatterplot II. the residuals plot III. the correlation coefficient A) I only B) II only C) III only D) I and II only E) I, II, and III rocedwrp 2020-11-09 Answered

### The two-way table summarizes data on the gender and eye color of students in a college statistics class. Imagine choosing a student from the class at random. Define event A: student is male and event B: student has blue eyes. $$\begin{array}{c|cc|c} &\text{Male}&\text{Female}&\text{Total}\\ \hline \text{Blue}&&&10\\ \text{Brown}&&&40\\ \hline \text{Total}&20&30&50 \end{array}$$ Copy and complete the two-way table so that events A and B are mutually exclusive. Bergen 2020-11-09 Answered

### A researcher is interested in finding a $$90\%$$ confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 117 students who averaged 40.9 minutes concentrating on their professor during the hour lecture. The standard deviation was 11.8 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a ? distribution. b. With $$90\%$$ confidence the population mean minutes of concentration is between ____ and ____ minutes. c. If many groups of 117 randomly selected students are studied, then a different confidence interval would be produced from each group. About ____ percent of these confidence intervals will contain the true population mean minutes of concentration and about ____ percent will not contain the true population mean number of minutes of concentration. cistG 2020-11-09 Answered

### Identify the two most commonly used measures of center for quantitative data. Explain the relative advantages and disadvantages of each. Khaleesi Herbert 2020-11-09 Answered

### In the population, a parameter has a value of 10. Based on the means and standard errors of their sampling distributions, which of these statistics estimates this parameter with the least sampling variability? $$Mean = 10,\ SE = 5$$ $$Mean = 9,\ SE = 4$$ $$Mean = 11,\ SE = 2$$ $$Mean = 13,\ SE = 3$$ waigaK 2020-11-09 Answered

### Define Hypothesis testing and explain test of significance for small samples and large samples. djeljenike 2020-11-08 Answered

### The pathogen Phytophthora capsici causes bell pepper plants to wilt and die. A research project was designed to study the effect of soil water content and the spread of the disease in fields of bell peppers. It is thought that too much water helps spread the disease. The fields were divided into rows and quadrants. The soil water content (percent of water by volume of soil) was determined for each plot. An important first step in such a research project is to give a statistical description of the data. Soil Water Content for Bell Pepper Study \begin{matrix} 15 & 14 & 14 & 14 & 13 & 12 & 11 & 11 & 11 & 11 & 10 & 11 & 13 & 16 \\ 9 & 15 & 12 & 9 & 10 & 7 & 14 & 13 & 14 & 8 & 9 & 8 & 11 & 13 \\ 15 & 12 & 9 & 10 & 9 & 9 & 16 & 16 & 12 & 10 & 11 & 11 & 12 & 15 \\ 10 & 10 & 10 & 11 & 9 \end{matrix} If you have a statistical calculator or computer, use it to find the actual sample mean and sample standard deviation. permaneceerc 2020-11-08 Answered

### Construct 98% confidence intervals for the a) population variance and the b)population standard deviation $$\displaystyle\sigma$$ The number of hours of reserve capacity of 10 randomly selected automotive batteries. 1.71, 1.87, 1.58, 1.61, 1.78, 1.98, 1.36, 1.58, 1.47, 2.05, Assume the sample is taken from a normally distributed population. Anish Buchanan 2020-11-08 Answered

### Give the correct answer for this question: The Dunkers of Pennsylvania are members of a religious sect, about 50 of whom emigrated from Germany in the early 1700's. They have remained relatively isolated ever since. The frequency of blood group A in this small group is around 60% while in German and American populations generally, the frequency is 40%. The A) allele is absent in the Dunkers but comprises about 15% of the alleles in both German and ‘American populations. Construct an inference to account for the differences in gene frequencies among the Dunkers as compared to American and German populations. Cheyanne Leigh 2020-11-08 Answered

### Give a ffull answer its true or false: When an ANOVA comparing the means of 3 groups indicates that at least one group is different from the others, a common follow-up analysis to determine which group(s) is (are) different is pairwise two-sample t-tests each assessed using i) the pooled standard deviation when calculating the standard error for the difference in means and ii) a Bonferonni-corrected alpha level of 0.0167 to control the type I error rate for the overall inference to 5% BolkowN 2020-11-08 Answered

### A population of values has a normal distribution with mean 18.6 and standard deviation 57. If a random sample of size $$\displaystyle{n}={25}$$ is selected, Find the probability that a sample of size $$\displaystyle{n}={25}$$ is randomly selected with a mean greater than 17.5 round your answer to four decimal places. P=? mattgondek4 2020-11-08 Answered

### A population of values has a normal distribution with $$\displaystyle\mu={129.7}$$ and $$\displaystyle\sigma={7.7}$$. You intend to draw a random sample of size $$\displaystyle{n}={10}$$. Find the probability that a sample of size $$\displaystyle{n}={10}$$ is randomly selected with a mean less than 130.9. $$\displaystyle{P}{\left({M}{<}{130.9}\right)}=$$? Write your answers as numbers accurate to 4 decimal places. Lewis Harvey 2020-11-08 Answered

### In a similar study using the same design (sample of $$n = 9$$ participants), the individuals who wore the shirt produced an average estimate of $$M = 6.4$$ with $$SS = 162$$. The average number who said they noticed was (population mean) 3.1. Calculate a One Sample t-test using a two-tailed test with $$\displaystyle\alpha={.05}$$. illusiia 2020-11-08 Answered

### Distinguish the difference (purpose) between the two different types of chi-square 1.Chi-square test for independence (CTI) 2.Chi-square test for goodness of fit (CGF) 3.What type of variables are we using for a chi-square? sodni3 2020-11-08 Answered

### Write the Different Ways of Measuring Angles The custom of measuring angles using degrees, with $$\displaystyle{360}^{\circ}$$ in a circle, dates back to the ancient Babylonians, who used a number system based on groups of 60. Another system of measuring angles divides the circle into 400 units, called grads. In this system a right angle is 100 grad, so this fits in with our base 10 number system. Write a short essay comparing the advantages and disadvantages of these two systems and the radian system of measuring angles. Which system do you prefer? Why? tinfoQ 2020-11-08 Answered

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