2. In a random sample of 150 drivers arrested for DUI (drunk driving), 90% were males. The 99% confidence interval for the proportion of male drunk drivers is:

A 95% confidence interval for a population proportion, p, is 0.23 < p < 0.27. What was the sample proportion?

Suppose we wish to estimate the average number of hours per week that Americans watch TV. Use the following data from an SRS to find a 90% confidence interval: 30        64        49        40        21        58        9          43        39            43

50 of the 600 medical students who were chosen at random stated they intended to work in a rural area. Calculate the 90% confidence interval for the actual percentage of medical students who intend to practice in rural areas. The responses shown here are estimates.

Ten engineering schools in the US were surveyed. the sample contains 250 electrical engineers, 80 being women; 175 chemical engineers, 40 being women. Compute a 90% confidence interval for the difference between the proportions of women in these two fields of engineering. Select one: O a. (0.02, 0.16) Ob. (0.01, 0.17] O. (0.04, 0.14) O d. [0.03, 0.15]

8.2 question 5).  In 2013, the Gallup poll asked 1,039 American adults if they believe there was a conspiracy in the assassination of President Kennedy and found that 634 believe there was a conspiracy ("Gallup news service," 2013). Estimate the proportion of American’s who believe in this conspiracy using a 98% confidence interval.

The following is the number of hours of sleep obtained by eight college freshmen.  Use the data to find a 92% confidence interval for the true mean number of hours of sleep by college freshmen. ​​7.5​    8.0​   6.5​  24​  8.5​  6.5​  7.0​   7.5