A large university wants to see if the national claim that students owe $50,000 after 4 years of college is accurate. A statistics class at the university takes a random sample of 20 graduated students and finds that the average amount of debt after college is $60,000 with a sample standard deviation of $5,500. What are the degrees of freedom for the test? df=

Mario's weekly poker winnings have a mean of $353 and a standard deviation of $67. Last week he won $185. How many standard deviations from the mean is that?

Cody took his first physics exam and scored an 80. The population mean for this exam is 70, and the standard deviation is 5. What is the probability of selecting a person with a score greater than Cody’s?

In a recent year, Washington State public school students taking a mathematics assessment test had a mean score of 276.1 and a standard deviation of 34.4. A random sample of 64 students is drawn from this population. Identify the mean and standard deviation of the sample mean scores.   2. Find the probability that the sample mean score is at least 285.

Business Weekly conducted a survey of graduates from 30 top MBA programs. On the basis of the survey, assume the mean annual salary for graduates 10 years after graduation is $136,000. Assume the standard deviation is $39,000. Suppose you take a simple random sample of 9 graduates. Round all answers to four decimal places if necessary.

A single fair die is rolled seven times. Find the mean and standard deviation of the number of times a 3 appears.

Can someone please help? Thank you.

A business school dean in Ohio wants to know if graduates who completed an internship during their undergraduate years earn more than business undergraduates who do not complete an internship while in college.  Based on national survey from 1,500 business alumni with less than six years of work experience, they earn on average $50,970 with a standard deviation of $12,976.  Business alumni from the Ohio  school who completed internships on average earned $53,497.  The dean wants you to be 96% confident in your results. a. State in statistical terms the null and alternative hypotheses. b. Determine the appropriate test statistic (z or t). c. Determine the critical value(s). d. Compute the test statistic. e. Make a decision on the hypotheses. (which hypothesis is correct?) f. Determine the p-value for the test statistic.

In a study of Ridge View's boys' basketball team, the average height is 68 inches and standard deviation is 4 inches. Find the probabilty. a boy is over 78 inches

joans finishing time for the bolder boulder 10k race was 1.77 standard deviations faster than the womens average for her age group. there were 415 women in her group. assuming a normal distribution, how many women ran faster than joan? rounded down to the nearest whole number