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1. The population mean for an intelligence test is 100 with a standard deviation of 15. A sample of 200 students from a university has a mean of 102.
a. Construct a 95% confidence interval to estimate the mean for the population at the university. Interpret this interval in the context of this problem (in a complete sentence).
b. Construct a 99% confidence interval to estimate the mean for the population at the university. (don't need to interpret this interval)
2. The mean number of times a sample of 26 high school students checks Instagram in a week is 32 with a standard deviation of 13.
a. Construct a 95% confidence interval to estimate the population mean for the entire population of high school students. (don't need to interpret this interval)
b. Construct a 99% confidence interval to estimate the population mean for the entire population of high school students. Interpret this interval in the context of this problem (in a complete sentence).
3. Initially it may seem like a 100% confidence interval would be useful, but what is the problem with creating a 100% confidence interval?
agents at an insurance company office in a small town process an average of fifteen auto insurance claims per week.
You watch the station for 1? hour, at a randomly selected? time, and carefully observe that the amount of advertising time is equal to 12 minutes.
Let's assume that over the years, a paper and pencil test of anxiety yields a mean score of 35 for all incoming college freshmen.
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Interpret the regression coef?cient. Are subjects in the U.S. more willing to pay extra for non-biotech breakfast cereals than U.K. subjects, or are they less willing?
f two people are randomly selected, what is the probability that they both have Internet access?
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A die is rolled four times. What is the probability that the sum of four numbers equals 13?
Select a current/new piece of healthcare technology available to consumers. This canbe done through a web search or trip to your local Best Buy.
What kind of sampling have you done (simple random sampling, stratified sampling, systematic sampling or cluster sampling)?
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