Questions from Statistics

Q: In Example 1, the researcher selects a second random sample of

In Example 1, the researcher selects a second random sample of 30 student-athletes and records their numbers of hours spent on required athletic activities (see table at left). Use this sample to find...

Q: Use the data in Try It Yourself 1 and a 95%

Use the data in Try It Yourself 1 and a 95% confidence level to find the margin of error for the mean number of hours spent on required athletic activities by all student-athletes in the conference. A...

Q: Use the data in Try It Yourself 1 to construct a 95

Use the data in Try It Yourself 1 to construct a 95% confidence interval for the mean number of hours spent on required athletic activities by all student-athletes in the conference. Compare your resu...

Q: Use the data in Example 1 and technology to construct 75%,

Use the data in Example 1 and technology to construct 75%, 85%, and 90% confidence intervals for the mean number of hours spent on required athletic activities by all student-athletes in the conferenc...

Q: Construct a 90% confidence interval for the population mean age for

Construct a 90% confidence interval for the population mean age for the college students in Example 5 with the sample size increased to 30 students. Compare your answer with Example 5.

Q: Use the normal curves shown. / Which normal

Use the normal curves shown. Which normal curve has the greatest standard deviation? Explain your reasoning.

Q: In Example 6, how many student-athletes must the researcher

In Example 6, how many student-athletes must the researcher include in the sample to be 95% confident that the sample mean is within 0.75 hour of the population mean? Compare your answer with Example...

Q: Find the critical value tc for a 90% confidence level when

Find the critical value tc for a 90% confidence level when the sample size is 22.

Q: Construct 90% and 99% confidence intervals for the population mean

Construct 90% and 99% confidence intervals for the population mean temperature of coffee sold in Example 2.

Q: Construct 90% and 95% confidence intervals for the population mean

Construct 90% and 95% confidence intervals for the population mean number of days the car model sits on the dealership’s lot in Example 3. Compare the widths of the confidence intervals.