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Do students at various universities differ in how sociable they are? Twenty-five Students were randomly selected from each of three universities in a region and Were asked to report on the amount of time they spent socializing each day with Other students. The result for University X was a mean of 5 hours and an estimated Population variance of 2 hours; for University Y, M=4, S^2=1.5 and for University Z, M=6, S^2 =2.5. What should you conclude? Use the .05 level.
(a) Use the steps of hypothesis testing; (b) figure the effect size for the study; And (c) explain your answers to parts (a) and (b) to someone who has never had A course in statistics.
Make a decision using the p-value approach at the given α = 0.05.
Use three decimal places in your answers for this problem. The following table was collected.
Find the standardized test statistic to test the claim that mean1 = mean 2. Two samples are randomlu selected from each population. The sample statistics are given below.
Create a histogram over five class intervals.
Compute a 3-month moving average forecast of demand for April through January (of the next year).
You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. If convenien..
When the conditionally and unconditionally expected values of a discrete random variable would be different?
According to a recent poll, 53% of Americans would vote for an incumbent president. If a sample of 100 people results in 45% who would vote for the incumbent, test the claim that the percentage is 53%. Use a .10 significance level.
Calculate the mean absolute deviation based on the 2-day moving average. You can have a forecast and an actual temperature.
In the past, of all the students enrolled in "Basic Business Statistics" 10% earned A's 20% earned B's, 30% earned C's, 20% earned D's and the rest either failed or withdrew from the course.
Carry your intermediate computations to at least four decimal places. Round your answer to at least two decimal places.
We want to know if, at the α = 0.05 level, there is sufficient evidence to conclude that the average calorie content of 1-ounce chocolate chip cookies produced by this brand is greater than 110 calories.
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