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According to a recent national survey, high school girls average 100 text messages daily. Assume the population standard deviation is 20 text messages. a) describe the sampling distribution of x "bar on top" where x"bar on top" is the sample mean number of text messages for a random sample of 50 high school girls. b)What is the probability that teh sample mean is greater than or equal to 106 ? c) Sarah takes a random sample of 50 girls at her high school and finds the average number of text messages is 106. Do you think the average number of text messages girls send at sarah's high school is the same as the national average ? Why or why not.
Either about $800,000 or about $2.2 million depending on which "average" it used. Which type of "average" does the $800,000 represents?
Three children living, has assets of $156,000, has an index of health status of 141, and has 2.5 social activities a week on the average?
In particular, discuss whether there is enough information presented in the article to arrive at the same conclusion as reported."
C-Spec has determined that the machine has a sample mean of 4.001 inches with a standard deviation of .002 inch. Calculate the (capability index) for this machine.
question a car averages 27 miles per gallon. if gas costs 4.04 per gallon which of the following is closest to how much
Use a calculator or appropriate computer software to verify that, for the preceding data, xbar = 5.1.
A coin was flipped twenty times and landed heads fifteen times. Based upon this information, answer the following the question:
A special test is given to people complaining of sever headaches. if someone has a brain tumor, the test is positive with a probability of .8 (80%).
Calculate the total cost of interest for both mortgage options. How much does the buyer save in interest with the 20 year option ?
What is the level L (±0.0001) such that the probability that the average NOX level for the fleet is greater than L is only 0.03?
the manager of a youth-oriented clothing store at the local mall has determined that 27 of the males who enter the
There are two types of dependent samples: Those that measure something before and after an "event" and those that matching two samples of the same phenomena being observed. Which of the following is NOT true about such a test:
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