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The National Assessment of Educational Progress (NAEP) sample of 1077 young women had mean quantitative score =275. Take it as known that the standard deviation of all individual scores is = 60.
1. Suppose that the same result, the mean quantitative score = 275, had come from a sample of 250 women. Give the 95% confidence interval for the population mean in this case.
2. Then suppose that a sample of 4000 women had produced the sample mean 275, and again give the 95% confidence interval for the population mean.
3. What can you say about the effect of sample size on confidence intervals?
Discuss at least three reasons why these predictions may not be accurate and offer three ways in which you can increase the likelihood of accurately predicting your customers' purchases.
At the 0.01 significance level, can we conclude that the mean number of patients per day is more than 25? Estimate the p-value and interpret it.
You are a realtor with a small business. You use a simple 2 variable linear regression analysis for quick first glance house price estimates using square footage of the house.
To test whether the population mean is less than a specified value.
Suppose that, from a population of 75 bank accounts, we want to take a random sample of six accounts in order to learn about the population. How many different random samples of six accounts are possible?
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
The times for 300 college students of introductory statistics to complete a one-hour times exam.
When the effect of a level for one factor depends on which level of the other factor is present, use: Select one:
If the loss of weight of customers at the end of their first month is normally distributed with a mean of 6.7lbs and a standard deviation of 0.81lbs
In the past, Bly has tended to estimate warranty expenses on the high end to be conservative. He must work with the dealership's accountant at year-end to arrive at the warranty expense accrual for cars sold each year.
Explain briefly and in nontechnical language what "a significant difference (P
Her results (in hours until turning a particular shade of brown) are in the table below. At ∞= .01, did she see a difference between the two treatments?
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