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What is the medical term for:  The fluid portion of the blood.

The file Baseball Players_2015.xlsx, sheet named Baseball Players, contains salary data on all Major League Baseball players for year 2015. Based on the histogram (see question 6), is Salary skewed positively or negatively   Note: for datafile, see question 1.

According to CBS Money Watch, the average monthly household cellular phone bill is $100. Suppose monthly household cell phone bills are normally distributed with a standard deviation of $11.35. What is the probability that a randomly selected monthly cell phone bill is more than $110? Round your answer to 3 decimal places. For example, if the answer is 0.52443, enter 0.524

The length of a 90% confidence interval for mean Age is which of the following? (Because of potential roundoff, choose the closest.) Data file: Data file – Question 3.xlsx

The length of a 99% confidence interval for mean Age is which of the following? (Because of potential roundoff, choose the closest.) Data file: Data file – Question 3.xlsx

You want to test the null hypothesis that the mean amount spent is less than or equal to $1,400 versus a one-tailed alternative. Which of the following is the p-value for the test? (Because of potential roundoff, choose the closest.) Data file: Data file – Question 4.xlsx

The file Baseball Players_2015.xlsx, sheet named Baseball Players, contains salary data on all Major League Baseball players for year 2015. Is the average salary for pitcher team Washington Nationals higher than the average for all pitchers?    Note: for datafile, see question 1.

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 employee benefits manager of a large public university would like to estimate the proportion of full-time employees who prefer adopting the first (plan A) of three available health care plans in the next annual enrollment period. A random sample of the university’s employees and their tentative health care preferences are given in the file Healthcare.xlsx below. Calculate a 90% confidence interval for the proportion of all the university’s employees who favor plan A. What are the values of lower limit and upper limit? Round your answer to 3 decimal places. Healthcare.xlsx

Ship collisions in the Houston Ship Channel are rare. Suppose the number of collisions are Poisson distributed, with a mean of 1.4 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.