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What is the probability that he will answer all ten questions incorrectly?
Using the five steps of hypothesis testing and the 5% significance level (alpha), does showing the film change students' attitudes towards the chronically mentally ill?
"A worldwide organization of academics claims that the mean IQ score of its members is 115 , with a standard deviation of 16. A randomly selected group of 35 members of this organization is tested,
Your office has just received 140 insurance claims to be processed in the next few days. Find the following probabilities. half or more of the claims have been padded
Scores of high school students on a national mathematics exam in Egypt were normally distributed with a mean of 86 and a standard deviation of 4.
The underlying data are in file XR10033.Identify and interpret the p-value for the test. Using the 0.025 level of significance, what conclusion will be reached?
Fifty-four percent of men consider themselves basketball fans. You randomly select 10 men and ask each if he considers himself a basketball fan. Find the probability that the number who consider th
Their mean monthly sales were $10,000 with a standard deviation of $1000. Construct a 95% confidence interval for the population mean.
870 people were selected for grand jury duty, and 39% if them were Americans of Mexican ancestry. Among the people eligible for grand jury, 79,1% were Americans of Mexican ancestry. Use a 0.01 signi
if nurses want to estimate with 90%confidence the mean NIPS score of all babies who are wrapped and held this way during the procedure, what will their estimate be?
A student is proposing a business plan to open a tax preparation business. The proposed business has $ 3,000 per month of fixed expenses (rent, utilities, insurance, manager's salary).
A technician services mailing machines at companies in the Phoenix area. Develop a probability distribution for the duration of a service call.
A researcher is interested in estimating the average salary of teachers in a large urban school district. She wants to be 95% confident that her estimate is correct. If the standard deviation is $1
If you select random samples of 25 calls, what percentage of the sample means would be between 7.8 and 8.2 minutes?
the required sample size needed to be able to estimate the mean dollars that each card holder will spend each month. It would like to be within plus or minus $55 of the true mean with a 95% confiden
The study found that men who had participation in some vigorous activity at least twice a week in high school, college and up to age 40 had a 60% reduced risk of Parkinson's disease developing. The
From the test data, can we determine whether the oven has an effect on the cake's density? The null hypothesis should be: Oven has no effect on density.
A tamiami shearing machine is producing 10 percent defective peices, which is abnormally high. The qulaity control engineer has been checking the output by almost continuous samplin since the abnorm
What is the average inventory? What is the annual holding cost?
A sample standard deviation of 90 pounds. At the 5% level of significance, would we reject the null hypothesis that the mean breaking load is 510 pounds or more?
Of the adult US population 36% has an allergy. A sample of 1200 randomly selected adults resulted in 33.2% reporting an allergy.
What is the probabillity that in a random sample of 1,200 undergraduate business students, 336 or more will major in accounting?
You are the designer for your company's web site. You have data to indicate that the mean download time for the homepage is 7 seconds and that the standard deviation of download time is 2.0 seconds.