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Families USA, a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers. It found that the annual health insurance premium s for a family with coverage through an employer averaged $10,979. The standard deviation of the sample was $1,000.
How large of a sample is needed to find the population mean within $250 at 99 percent confidence?
i what is the sampling distribution of a sampe mean for a normally distributed random variable.ii if a variable iq is
In a Singapore Edition of Business Times, diamond pricing we explored. The price of a diamond is based on the diamond's weight, color, and clarity. A Simple random sample of 18 one-half-carat diamonds had the following prices, in dollar's
Median score of 67. Based on this information, the distribution of test scores is symmetric, left skewed, right skewed, or bimodal?
Suppose an unfair coin comes up tails 42% of the time if it is flipped. If the coin is flipped 13 times, what is the probability that?
A sample of 36 packages reveals the mean weight to be 3.01 pounds, with a standard deviation of 0.03 pounds. Determine a 95 percent confidence interval for the population mean.
The mean SAT verbal score is 412, with a standard deviation of 90. Use the Empirical Rule to determine what percent of the scores lie between 412 and 592.
Dr. S wishes to measure the effect of TV viewing on reading scores in elementary school children. The data for the sample are shown here. Assume the population is normal.
for women age 25-34 with full-time jobs the average income in 2004 was 32000 and the sd for income was 26000. assuming
Using a sample of size n=120, what is the standad deviation of our estimator P? What is the probability that the sample proportion will be at least 0.45?"
if you know that 48 of children born are male what is the probability of having 2 girls and one boy in a family of 3
in usa today sept. 5 1996 the results of a survey involving the use of sleepwear while traveling were listed as
Change the frequencies to percentages - is there a group more likely to get high salaries.
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