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A sociologist claims that the success of students in college (measured by their GPA) is related to their family's income. For a sample of 20 students, the coefficient of correlation is 0.40. Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
Calculate a 95% confidence interval for the population mean, based on the sample 10, 12, 13, 14, 15, 16, and 49.
Also use the regression model to predict a student's average if he/she misses 4 classes.
Critically discuss the Central Limit Theorem? How large should the sample size be if the underlying distribution of the population values are:
Give null and alternative hypotheses for this test in symbolic form.
Testing for population mean - How would this information be useful to you if you were the college register?
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
Do the data indicate that the lengths of one supplier's 2x4's are subject to more variability than those of the other supplier? Assume α = 0.05. (HINT: F Test for Differences in Two Variances)
What is the 95% confidence interval estimate of the mean television viewing time per week during the 8:00 p.m. to 11:00 p.m. time period?
Find the value of q-hat from proportion and degrees of freedom used to find the t-score.
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
Public transportation and the automobile are two methods an employee can use to get to work each day. Samples of times recorded for each method are shown. Times are in minutes.
If probability of drawing a face card is 0.625. Determine the probability of not drawing a face card.
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