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You work for a consumer watchdog publication and are testing the advertising claims of a tire manufacturer. The manufacturer claims that the life spans of the tire are normally distributed with a mean of 40,000 miles and a standard deviation of 4000 miles. You test 16 tires and get the following life spans. Complete parts A through C
47,704 41747 26,505 35,027 34,152 43,214 39,793 36,109
25,610 31,824 36,947 36,297 31,963 38,163, 38,596 46000
Mean=
standard deviation=
Select a question of your own to investigate using one of the hypothesis tests studied in this class. Explain why you chose the particular question to investigate. State a provable claim (corresponding to the alternative hypothesis). Write the n..
The following data represent the cost of electricity for the period of July 2008 for a random sample of 50 one-bedroom apartments in a large city.
The mean number of words per minute read by sixth graders is 89 with a standard deviation of 16. If 66 sixth graders are randomly selected, what is the probability that the sample mean would be greater than 92.25?
Also compute a 95% confidence limit for the difference in the two proportions. Contrast what statements can be made from the test and the confidence limits.
What is the probability that the income is between $1,000 and $1,800? (Be able to draw a graph to illustrate your results)
Standard deviation versus standard error. Explain the difference between the standard deviation of a sample and the standard error of a statistic such as the sample mean.
Find the probability that all four have blue eyes.- Find the probability that none has blue eyes.- Find the probability that exactly two have blue eyes.
Using an investment game, the study demonstrated that people who inhaled oxytocin were more likely to give their money to a trustee compared to people who inhaled an inactive placebo. For this experimental study, identify the independent variable ..
1. In a basket there are 6 red marbles and 4 blue marbles. What is the probability of drawing a red marble--P(R)? 2. In a basket there are 6 red marbles and 4 blue marbles. Given that you have selected a red marble and have placed it in the basket,..
if a researcher wishes to conduct a study about how much consumers in a target market segment intend to spend on a type
Some Linux distributions are set up so that a root userid is not created during the installation process. In such cases, your regular password serves as the superuser password. Why would a distribution be set up in this way? What are the advantage..
International Data Corp. (IDC) has shown that the average return on business analytics projects was almost four-and-a-half times the initial investment.
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