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A car company claims that its compact model gets 31 miles per gallon. A government inspector tests 38 of the company cars and finds that the average mileage is 29.7 mpg with a standard deviation of 2.2 mpg. Test if the mileage found is significantly less than the mileage claimed by the company using a = 0.01.
These predictions, however, are not very accurate. 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.
If the average price of a new home is 145,000 what is the minimum and maximum prices of the houses a contractor will need to build to include the middle 80% of the market.
The National Assessment of Educational Progress (NAEP) gave a test of basic arithmetic and the ability to apply it in everyday life to a sample of 840 men 21 to 25 years of age.
Could this information be viewed as representing the nominal scale of measurement? If so, explain your reasoning. If not, why not? Could this information be viewed as representing the ratio scale of measurement? If so, explain your rea- soning. I..
in the article a multifactorial intervention program reduces the duration of delirium length of hospitalization and
The combined production level should not exceed 1200 units per month. The demand for product II is no more than half the demand for product I.
1. When you construct a 95% confidence interval, what are you 95% confident about? 2. What is the effect of sample size on the width of a confidence interval?
A grocery supplier believes that in a dozen eggs, the mean number of broken ones is 0.6 with a standard deviation of 0.5 eggs. You buy 3 dozen eggs without
Only 3 reported that their health was excellent. Find the probability that when 13 adults are randomly selected, 3 or fewer are in excellent health.
The managers in a company's East and West regions were rated on the basis of the company's evaluation system. A researcher wishes to conduct a t-test of means to determine if there is a difference between the East and West regions.
Suppose a couple want to have children until they have two children of each sex. What are the mean and the variance of the total number of children they will have?
How much should be budgeted for weekly repairs, cleaning and maintenance so that the probability that the budgeted amount will be exceeded in a given week.
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