Americans have become increasingly concerned about the rising cost of medicare. in 1990, the average annual medicare spending per enrollee was $3267; in 2003, the average annual medicare spending per enrollee was $6883 (money, fall 2003). suppose you hired a consulting firm to take a sample of fifty 2003 medicare enrollees to further investigate the nature of expenditures. assume the population standard deviation for 2003 was $1800. when calculating values for z, round to two decimal places. calculate the standard error of the mean amount of medicare spending for a sample of fifty 2003 enrollees (to 2 decimals). what is the probability that the sample mean will be within +/- $300 of the population mean (to 4 decimals)? what is the probability that the sample mean will be greater than $7500 (to 4 decimals)? if the consulting firm tells you the sample mean for the medicare enrollees it interviewed was $7500, would you question whether the firm followed correct simple random sampling procedures?

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

It appears that people who are mildly obese are less active than leaner people. one study looked at the average number of minutes per day that people spend standing or walking. among mildly obese people, the mean number of minutes of daily activity (standing or walking) is approximately normally distributed with mean 376 minutes and standard deviation 64 minutes. the mean number of minutes of daily activity for lean people is approximately normally distributed with mean 528 minutes and standard deviation 107 minutes. a researcher records the minutes of activity for an srs of 7 mildly obese people and an srs of 7 lean people. use z-scores rounded to two decimal places to answer the following: what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 mildly obese people exceeds 420 minutes? what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 lean people exceeds 420 minutes?

The radius of the circle below intersects the unit circle at (3/5,4/5). what is the approximate value of theta? 0.6 radians 1.0 radians 36.9 degrees 53.1 degrees