The length of a 95% confidence interval for mean Age is which of the following? (Because of potential roundoff, choose the closest.) Data file: Data file – Question 3.xlsx

Suppose that two dice are tossed. For each die, it is equally likely that 1, 2, 3, 4, 5, or 6 dots will turn up. Let S be the sum of the two dice. What is the probability that S will be 3 or 11? Round your answer to 3 decimal places.  

A survey conducted for the Northwestern National Life Insurance Company revealed that 70% of American workers say job stress caused frequent health problems. Suppose a random sample of 25 American workers is selected. Based on the relevant binomial distribution, answer the following questions about X, the number of American workers who say job stress caused frequent health problems:                                   What is the probability that X is no more than 14? Round your answer to 3 decimal places. For example, if the answer is 0.52443, enter 0.524

A survey conducted for the Northwestern National Life Insurance Company revealed that 70% of American workers say job stress caused frequent health problems. Suppose a random sample of 25 American workers is selected. Based on the relevant binomial distribution, answer the following questions about X, the number of American workers who say job stress caused frequent health problems:                                   What is the probability that X is no more than 15? Round your answer to 3 decimal places. For example, if the answer is 0.52443, enter 0.524

The U.S. national average door-to-doctor wait time for patients to see a doctor is now 21.3 minutes. Suppose such wait times are normally distributed with a standard deviation of 6.7 minutes. Some patients will have to wait much shorter than the mean to see the doctor. Based on this information, 20% of patients will have to wait less than how many minutes to see a doctor? Round your answer to one decimal place.

The file Baseball Players_2015.xlsx, sheet named Baseball Players, contains salary data on all Major League Baseball players for year 2015. What is average salary for the position Pitcher? Round your answer to whole number. [Hint: you may consider creating Table to filter the data]   Note: for datafile, see question 1.

Ship collisions in the Houston Ship Channel are rare. Suppose the number of collisions are Poisson distributed, with a mean of 1.2 collisions every four months. What is the probability of having two or less collision over a four-month period? Round you answer to 3 decimal places. For example, if the answer is 0.52443, enter 0.524 below.

The file Baseball Players_2015.xlsx, sheet named Baseball Players, contains salary data on all Major League Baseball players for year 2015. Which of the following is the correct histogram for the variable Salary? Note: the histogram is constructed using 10 class intervals.   Note: for datafile, see question 1.

A sport analyst wants to determine the mean salary of a Baseball player for 2015. He believes an estimate of this average salary using a confidence interval is sufficient. How large a sample should he take to be within $497,000 of the actual average with 80% confidence? He calculates the standard deviation of salary for all baseball players for 2015 is about $5,478,384.55. Round your answer to whole number.   Use the attached Excel spreadsheet to calculate the answer for this question: Blank spreadsheet for your use.xlsx 

Assume the heights in a male population are normally distributed with mean 70.3 inches and standard deviation 4.1 inches. What is the probability that a typical male from this population is between 5 feet 9 inches (i.e. 69 inches) and 6 feet (i.e. 72 inches) tall? Round your answer to 3 decimal places. For example, if the answer is 0.52443, enter 0.524 below.