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Use a t-test to investigate the claim and assume that the population is normally distributed:
A large university says the mean number of classroom hours per week for full-time faculty is more than 9. A random sample of the number of classroom hours for full-time faculty for one week is listed. At ? = 0.05, test the university's claim.
10.7 9.8 11.6 9.7 7.6 11.3 14.1 8.1
How many commercials' worth of data do I need to have a margin of error no more than 3, the correct set of hypotheses
The accounting association has 15 members, 10 of which are CPAs. The members are to be selected to study ways to increase membership. What is the probability of all three selected are CPAs?
Help with showing how do detrime the standard deviation of a problem when the standard deviation is 5. An example would help me to work out a problem for the normal probability distribution.
A random sample of 80 voters found that 44% were going to vote for a certain candidate. Find the 90% limit for the population proportion of voters who will vote for that candidate?
A random sample of 15 college graduates revealed that they worked an average of 5.3 years on the job before being promoted. The sample standard deviation was 1.2 years. Using the 0.95 degree of confidence, what is the confidence interval for the p..
The Weschsler IQ test has a μ =100 and a σ = 15. A vitamin company said if people took vitamin X for 30 days their IQ would improve. A simple random sample of 49 people took the vitamins for 30 days. They then took the IQ test. The mean IQ of the ..
Re item 4, assume the critical value for this test is 4.92, and you obtain a computed statistical value of 7.45. Is there evidence to refuse null hypothesis? Describe why or why not?
Scores on an endurance test for cardiac patients are normally distributed with mean = 182 and standard deviation = 24.
What is the value of the test statistic? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
The study does not give sufficient evidence to support the claim that less than 75% of college students spend less than $250 per semester on textbooks.
Should Katie conduct a between-subject ANOVA or a within-subject ANOVA? Describe your answer.
A restaurant monitors its customer's complaints, With information, which of the following is a Pareto chart of the data?
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