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1. A simple random sample of 50 adults Is obtained and each person's red blood cell count is measured (in microliters). The sample mean is 4.63. The population standard deviation for red blood cell counts is .54. Construct a 99% confidence interval estimate of the mean red blood cell count of adults. 2. What percentage of a normal distribution is within 2 standard deviations of the mean? (Select the closest answer.) a. 50%b. 95%c. 75%d. 100% 3. The area under the standard normal distribution between -2.5 and 1.5 isa. 0.1338b. 0.1668c. 0.4332d. None of the above 4. A real estate agent records the ages of 50 randomly selected home buyers in her sales area. The mean age is 38 years, with a sample standard deviation of 8 years.
a. Find a 99% confidence interval for the population mean age. 5. A simple random sample of 120 SAT scores has a mean of 1520. Assume that SAT scores have a standard deviation of 300. Construct a 95% confidence interval estimate of the mean SAT score.
In a regression analysis involving 30 observations, the following estimated regression equation was obtained.
According to the Internal Revenue Service, the mean tax refund for the year 2007 was $ 2,708. Assume the standard deviation is $ 650 and tha the amounts refunded follow a normal probability distribution.
in order to determine the average weight of carry-on luggage by passengers in airplanes a sample of 16 pieces of
Collect on its accounts receivable is 36 with a standard deviation of 11 days. What is the probability that a single AR account takes more than 30 days to collect?
Let X be the random variable which denotes the number of saves that are made by the lacrosse goalie. Find the expected value and standard deviation of the random variable.
Let p represent the population proportion of all numbers in the corporate file that have a first nonzero digit of 1. Test the claim that p is less than 0.301 by using What is the P-value of the test statistic?
a random sample of 100 voters in a community produced 59 voters in favor of candidate a. the observed value of the test
Which of the following is not a characteristic of successful Six Sigma programs? Which of the following is the most important factor associated with Design of Experiments (DOE)?
Do the data provide significant support for any preferences among the three brands? Test At the .05 level of significance.
gigi and ron are candidates for mayor in a city. you want to estimate the proportion of gigis voters with 90 confidence
bachelor's degrees; and of 75 male nurses, 34 had bachelor's degrees. If a nurse is selected at random, and the probability that the nurse is? A female nurse with a bachelor's degree.
A normal distribution has a mean of 80 and a standard deviation of 14. Determine the value above which 80 percent of the values will occur.
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