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Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give (a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, (b) the Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
PopulationStudy Sample Score p Tails of TestA 100.0 10.0 80 .05 1 (low predicted)B 100.0 20.0 80 .01 2C 74.3 11.8 80 .01 2D 16.9 1.2 80 .05 1 (low predicted)E 88.1 12.7 80 .05 2
There are 6 different factors labeled as A, B, C, D, E, and F. Given that D=AB, E=-AC, F=-BC, please provide the corresponding 26-3 design table. Also, please write down the complete defining relation and the complete effect alias structure.
The parameter of interest is the mean score in this population. The sample is an SRS of size n = 4 drawn from the population. a) Find the mean of the 10 scores in the population. This is the population mean.
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (water, heat, electricity).
If you must estimate the population mean within 10 days, how many outside salespeople should you sample? Use the 90 percent confidence level.
An analyst wishes to include number of older siblings in family as a predictor variable in a regression analysis of factors affecting maturation in eighth graders. The number of older siblings in the sample observations ranges from 0 to 4.
Internet users age 12-17 in proportion who opposes ads? Solve manually and then by mega stat. Point to your decision rule, your hypotheses and statistical and management conclusions."
"You are running a chi-squared test. If you have 5 groups with 3 characteristics each, what would your critical value be with an alpha of .25? a . Between 0 and 3.0
State the reasons for your decision and include an explanation of why you did not follow the recommendations of the stakeholders.
For a population with a mean of μ = 60 and a standard deviation of σ = 24, find the Z score corresponding to each of the following samples.
We desire to test at 0.05 level of significance whether modification increases the life of battery. What is our decision rule? Reject null hypothesis if calculated t is less than 1.96.
Suppose the credit center selects five cardholders at random. What is the probability that all five cardholders will pay their new monthly balance in full before the payment due date?
Classify as independent or dependent samples: The average price of gasoline at ten local stations, and the average price of gasoline at ten stations in another state.
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