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Employee Salaries
Suppose that 500 employees each took a random sample (with replacement) of 100 employees at their office and recorded the salaries of the employees in their sample.
Then each employee used his or her data to calculate an 80% confidence interval for the mean salary of all employees at the office.
How many of the 500 intervals would you expect not to capture the true population mean? Explain by showing your calculation.
Guessing a regression line. In the Correlation and Regression applet, click on the scatterplot to create a group of 15 to 20 points from lower left to upper right with a clear positive straight-line pattern (correlation around 0.7). Click the "Dra..
Those in group 3 study with no sound at all. After studying, all students take a 10 point multiple choice test covering the material. The results are listed below. Use SPSS to conduct a one-way ANOVA to determine if Dr. Larm's hypothesis is correc..
Suppose a large sample is selected (instead of just 10). About 95 percent of the predictions regarding sales would occur between what two values? Determine the regression equation.
What is the probability of a child ending up with a bus stop as gender-unbalanced as my son's in our school district - perform the hypothesis test
(b) Reanalyze the data using R-mode analysis, that is, using the age distribution as the rows of the data matrix (Table 8.28). Can you determine the historical (time) behavior of the different age groups across race and sex?
Calculate the standard error of the sample mean - Compared to our original sample size of n = 30, what happens to the distribution of the sample mean?
Find the conservative margin of error for the arts and humanities faculty, and use it to compute an approximate 95% confidence interval for the percent of them in the population who favored this policy.
A student survey. Tonya wants to estimate what proportion of the students in her dormitory like the dorm food. She interviews an SRS of 50 of the 175 students.
a random sample of 6 music majors playing song s counted the number of mistakes each made. then these musicians played
Develop an ANOVA table for the regression analysis of hours studied as a predictor of the grade earned on the first statistics exam.
State the null and alternative hypotheses you would use to test whether the year-end bonuses paid by Jones & Ryan were different from the population mean.
Using your answers to the earlier parts of this question, explain how the sample size affects the mean and SD of the sum of a collection of random variables. Limit your answer to 2-3 sentences.
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