1.It is believed thatGCC Intermediate Algebra students get less than 7 hours of sleep per night, on average. A survey of 42 GCC Intermediate Algebra students generated an average of 7.24 hours with a standard deviation of 1.93 hours. At a level of significance of 5%, do LTCC Intermediate Algebra students get less than 7 hours of sleep per night, on average?

In your answer, show your hypothesis (2 points), your calculated z or t score (2 points), and your decision to accept or not accept the null hypothesis (1 point).

2.A research center claims that 35% of college graduates think a college degree is not worth the cost. You decide to test this claim and ask a random sample of 350 college students whether they think a college degree is not worth the cost. Of those surveyed, 37% reply yes. At alpha = 0.10, is there enough evidence to reject the claim?

3. In your answer, show your hypothesis (2 points), your calculated z or t score (2 points), and your decision to accept or not accept the null hypothesis (1 point).

The attention span of a two year-old is normally distributed with a mean of about 8 minutes and a standard deviation of 1.45 minutes. Suppose we randomly survey 60 two year-olds. What is the probability that a two year old has an attention span of more than 8.5 minutes?

4.An organization in 1995 (!) reported that teenagers spent an average of5.25 hours per week on the telephone. The organization thinks that, in 2010, the average is higher.81randomly chosen teenagers were asked how many hours per week they spend on the telephone. The sample mean was5.50 hours with a sample standard deviation of 2.15.At the 5% level of significance, isthe organization correct? In your answer, show your hypothesis (2 points), your calculated z or t score (2 points), and your decision to accept or not accept the null hypothesis (1 point).

5.

A slice of pizza in the college Cafe has a mean price of $2.59 with a standard deviation of $0.35. If you sample 21 days of pizza sales, what is a 95% confidence interval for the price of pizza? (continue to use 2 decimal places in your answer)

Show your value for E (3 points), and your confidence interval (2 points).

6. A travel association claims that the mean daily meal cost for two adults traveling together in San Francisco is $105. A random sample of 20 such pairs of adults has a mean daily meal cost of $110 and a standard deviation of $8.50. Is there enough evidence to reject the claim at alpha = 0.01?

In your answer, show your hypothesis (2 points), your calculated z or t score (2 points), and your decision to accept or not accept the null hypothesis (1 point).

7.

A medical researcher claims that 5% of children under 18 years of age have asthma. in a random sample of 250 children under 18 years of age, 9.6% say they have asthma. At alpha = 0.08, is there enough evidence to rreject the researcher's claim?

In your answer, show your hypothesis (2 points), your calculated z or t score (2 points), and your decision to accept or not accept the null hypothesis (1 point).

8.The Department of Motor Vehicles claims that the mean wait time is less than or equal to 20 minutes. A random sample of 17 people has a mean wait time of 21.5 minutes with a standard deviation of 2.7 minutes. At alpha = 0.10, test the office's claim.

In your answer, show your hypothesis (2 points), your calculated z or t score (2 points), and your decision to accept or not accept the null hypothesis (1 point).