1. Several years ago, 51% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,075 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,075 surveyed, 494 indicated that they were satisfied. Construct a 90% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed.

Use technology to find the 90% confidence interval.

The lower bound is_____

The upper bound is______

2. The average daily volume of a computer stock in 2011 was =35.1 million shares, according to a reliable source. A stock analyst believes that the stock volume in 2014 is different from the 2011 level. Based on a random sample of 30 trading days in 2014, he finds the sample mean to be 25.5

million shares, with a standard deviation of s=14.7 million shares. Test the hypotheses by constructing a 95%

confidence interval.

Construct a 95% confidence interval about the sample mean of stocks traded in 2014.

The lower bound is______ million shares.

The upper bound is_____million shares.

3. Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students in group 2 were asked to think about soccer hooligans. These pretest thoughts are a form of priming. The 200 students in group 1 had a mean score of 23.2 with a standard deviation of 4.1,

while the 200 students in group 2 had a mean score of 16.4with a standard deviation of 2.8.

Determine the 95% confidence interval for the difference in scores, 12. Interpret the interval.

The lower bound is______

The upper bound is_______

(Round to three decimal places as needed.)

4. In a random sample of 100 audited estate tax returns, it was determined that the mean amount of additional tax owed was $3460 with a standard deviation of $2574.

Construct and interpret a 90% confidence interval for the mean additional amount of tax owed for estate tax returns.

The lower bound is_______

The upper bound is_______

(Round to the nearest dollar as needed.)

5.Determine the point estimate of the population proportion, the margin of error for the following confidence interval, and the number of individuals in the sample with the specified characteristic, x, for the sample size provided. Lower bound=0.506, upper bound=0.794, n=1500

The point estimate of the population proportion is_______(Round to the nearest thousandth as needed.)

The margin of error is_______(Round to the nearest thousandth as needed.)

The number of individuals in the sample with the specified characteristic is______ (Round to the nearest integer as needed.)