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Suppose there are two elementary schools in a county. One school (A) loans all its students a laptop computer for use in classes. The other (B) does not. We would like to compare performance on a standardized test for the two groups of students.??There are 28 students randomly chosen from school A and 34 from school b. The average test score for A is 78, and for B is 75. The sample standard deviation for A is 7 and for B is 10. While the population variances are unknown, we will assume they are equal.??a. What is the 99% confidence interval for the difference between the two school's scores. (For consistency, let the difference d=A-B.)???b. Suppose we want to perform a two-tailed test where H0 is that μd=0. What is (approximately) the p-value of the test?
PiggyBank has narrowed its options down to two incentive plans: The bank doesn't know whether consumers would shop online more than at clothing stores.
Explain the difference between a left-tailed, two-tailed, and right-tailed test with examples from your own experience for each.
It is impossible to obtain a standard error less than 2 for any sized sample.
In a survey on the quality of customer service at Car Toys, customers were asked to rate the service on a scale from 1 to 10, with 10 being that a customer was completely satisfied.
A researcher is studying IQ levels. From past experience she knows the population mean IQ for adults is 110 and the standard deviation is 15.
A retail store manager is trying to estimate the average purchase transaction amount for a particular store. She takes a sample of 35 transactions and determines the mean purchase transaction amount from this same is $85 with a standard deviation ..
If appropriate, use the Tukey-Kramer procedure to examine differences among machines. What can you conclude about the effects of machines on breaking strength? Explain.
Critically discuss why you would or would not expect each of the following variables to be normally distributed.
You are conducting a study for which it is critical that the findings be representative of the population of interest. Which of the following research methods runs the greatest risk.
A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years.
Based on this, what is the probability that the mean weight of the bales in a sample of n=64 bales will be between 78 and 82 pounds?
The Scatter plot can more easily be generated using the Chart procedure.
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