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Listed below are the winning times in seconds, of men in the 100-meter dash for consecutive summer Olympic games, listed in order by row. Assuming that these results are sample data randomly selected from the population of all past and future Olympic games, test the claim that the mean time is less than 10.5 seconds. What do you observe about the precision of the numbers? What extremely important characteristics of the data set are not considered in the hypothesis test?
12.0
11.0
11.2
10.8
10.6
10.3
10.4
10.5
10.2
10.0
9.95
10.14
10.06
10.25
9.99
9.92
9.96
Calculate the population mean and population standard deviation.
The researchers planned to use simple linear regression to see if the age at which a baby was first able to crawl could be predicted from the average outdoor temperature six months after each baby's birthdate.
A manufacturer of dodge balls uses a machine to inflate its new balls to a pressure of 13.5 pounds (σ =0.1). When the machine is properly calibrated, the mean inflation pressure s 13.50 pounds, but uncontrollable factors can cause the pressure of ..
You want to know whether the population means are different in the two populations. Conduct an hypothesis test using an alpha of .05 and the critical value method.
If the mean times for both George and Julia are actually the same, what is the probability that George will be let go?
Use a 95% confidence interval for multiple comparisons. Show your calculation by hand between Monday and Tuesday. Match your answer with Minitab output. Attach Minitab output.
What does the standard deviation mean? Interpret the standard deviation relative to the average or mean?
If true explain and if false give an example. a. The significance level of a statistical test is equal to the probability that the null hypothesis is true. b. If the significance level of a test is decreased, the power of the test would be expected t..
An educational study uses a simple pre-post design to assess the efficacy of a computer tutor for solving inequalities. Twelve pilot students participate. Each student is given a pre-test, then participates in six sessions using the tutor, then i..
Assume the arrival of these emails is approximated by the Poisson distribution.
In study of a clinical for an allergy drug 115 of the 204 subjects reported experiencing important relief from their symptoms.
Find the mean ______________ and the standard deviation _____________
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