“can be read in one sitting”

(Answer all parts.)  In the General Social Survey, random adult Americans were asked if they were healthy and if they are happy.  Of 3000 people who claim to be healthy, 2500 also claimed to be happy.  Of 300 people who claim to be not healthy, 235 also claimed to be happy.  Test at a 5% significance level if the proportion of healthy adults who claim to be happy is higher than the proportion of unhealthy adults who claim to be happy. a) What are the hypotheses? b) What is the p-value? c)  Should we reject the null hypothesis?

What is the probability of flipping a coin 5 times and getting 5 tails in a row?

Use the Empirical Rule to compute percentages.  If a bell-shaped distribution has mean 40 and standard deviation 5, what approximate percentage of data values would be greater than 30?

In how many ways can 20 cars win 1st, 2nd, and 3rd in a race?

(Answer all parts)  Researchers randomly selected 12 adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cubic centimeters.  An analysis of the sample data revealed that the hippocampal volume is approximately normal with the sample mean equal to 8.10 cm3  (xbar=8.10) and standard deviation equal to 0.7 cm3 (s=0.7).  Let

(Answer all parts.)  In the General Social Survey, random adult Americans were asked if they were healthy and if they are happy.  Of 3000 people who claim to be healthy, 2500 also claimed to be happy.  Of 300 people who claim to be not healthy, 240 also claimed to be happy.  Test at a 5% significance level if the proportion of healthy adults who claim to be happy is higher than the proportion of unhealthy adults who claim to be happy. a) What are the hypotheses? b) What is the p-value? c)  Should we reject the null hypothesis?

Describe the shape of the distribution. (Skewed left, skewed right, or symmetric)

A company makes cell phones.  One out of every 90 cell phones does not work.  Suppose the company makes a 50$ profit on the sale of any working cell phone, but suffers a loss of $1000 for every faulty cell phone because they have to fix it.  Find the expected profit for the company for each cell phone sold.

(Answer all parts.)  In the General Social Survey, random adult Americans were asked if they were healthy and if they are happy.  Of 3000 people who claim to be healthy, 2500 also claimed to be happy.  Of 300 people who claim to be not healthy, 245 also claimed to be happy.  Test at a 5% significance level if the proportion of healthy adults who claim to be happy is higher than the proportion of unhealthy adults who claim to be happy. a) What are the hypotheses? b) What is the p-value? c)  Should we reject the null hypothesis?