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A simple random sample of size n is drawn from a population that is normally distributed. The sample mean x-bar is is found to be 114 and the sample standard deviation , s, is found to be 10.
A. Construct a 90% confidence interval about u if the sample size n is 15.
B. Construct a 90% confidence interval about u if the sample size n is 21.
C Construct a 99% confidence interval about u if the sample size is 15. show work
It is approximately 300 miles from Chicago, Illinois, to St. Louis, Missouri. allowing for various traffic conditions, a driver can average approximately 60 miles per hour.
1. nbspif the mean number of hours of television watched by teenagers per week is 12 with a standard deviation of 2
q1. consider a standard deck of cards that has 26 red cards and 26 black cards. find the probability of
An investor wants to assess at confidence level of 98% if a medicament can improve the marks of students. He notices that for the following daily dozes: 2,2.5,3,4.5,7 mg, the improvement over the students that studied the same but took no mental b..
Construct the 90 percent confidence interval for the proportion of checking account customers who have a Visa card with the bank. (Round your answers to 3 decimal places.)
Nationwide, the average waiting time until a electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 secon..
What is the upper limit of the 95% interval? Give your answer to three decimal places. Which of the following assumptions should be checked before constructing the above confidence interval?
Describe what the researcher must do if one of the requirements is not met and give illustrations.
What size sample would be required to estimate the proportion of hospital referrals with a margin of error of 0.04 or less at 95% confidence?
there are 10 steps leading up to the library entrance. you walk up the stairs taking 1 step at a time 2 steps at a time
solve the following standard normal probabilities to five decimalsa. pz gt 0.68b. pz gt -1.56c. pzd. p-1.22e. p2.78 gt
What is the distribution of sample means.
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