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A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 30.
Following are the American College Test (ACT) scores attained by the 25 members of a local high school graduating class:21 24 23 17 31 19 19 20 19 25 17 23 1621 20 28 25 25 21 14 19 17 18 28 20
Find P99, P90, and P80 for the ACT scores. [Hint: Use nk/100 to find the location in the ordered data for each percentile.]
Suppose we compare two population means, μ 1 - μ 2 . In each case, indicate how μ 1 relates to μ 2 :
Explain which indicate that changes in the concentration of carbon dioxide which cause changes in the global temperature
A) Describe the term population. B) Describe the term random sample. C) What is the difference between a population and a random sample?
Suppose normality, determine a 90% confidence interval for population variance.
Determine expected cell counts if null hypothesis is true and show them in a two-way table. Determine the chi-square() statistic?
Assuming that the variability is unchanged (i.e., σ = 6), is there sufficient evidence to suggest that the strength of the product has increased at the 1% level of significance?
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.
Compute test statistic and p -value for each sample. (Negative amount must be pointed out by minus sign.)
In a surgey of 280 adults over 50.80%; said they were taking vitamin supplements. Find the margin of error for this survey if we want a 99% confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
Be sure to show whether you use the t- or z- value, and what value you use. Interpret the confidence interval in a single sentence. In another sentence, state why you used either the "t" or the "z".
We want to test the hypothesis that population B has a smaller variance than population A.
If the population standard deviation is s = 10, is the sample sufficient to demonstrate a significant effect? Again, assume a two-tailed test with a = 0.05.
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