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A professor believes that the mean mark of final exam (out of 100) of his subject is more than 60. Accordingly, he selects 100 students at random and finds that the average mark to be 63 and the standard deviation is 15. To see if his belief is substantiated, conduct the test at a suitable significant level. State the assumptions made. see if his belief is substantiated, conduct the test at a suitable significant level. State the assumptions made.
A 95% confidence interval for µ is found to be 652 ± 21.56 = ($630.44, $673.56). Determine which of the following statements is true.
It does not matter, when data are skewed mean and median are the same.
The incubation time for Rhode Island Red chicks is normally distributed with a mean of 21 days and standard deviation of approximately 1 day.
This table gives three measurements of 10 samples made in a production run. Use statistical process control method to solve problem.
Find the mean, median, mode, and midrange for these data.
Evaluate z statistic for the Wilcoxon rank sum test, standard deviation for the Wilcoxon rank sum test and P-value for the Wilcoxon rank sum test
Determine the value of population mean? What is the best evaluate of this value?
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
To find the necessary sample size to achieve the given level of accuracy of prediction.
What is the probability that a sample mean will be within plus-or-minus two of the population mean for each of the following sample sizes?
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
Using an alpha level of 0.05, please use SPSS to perform a one-way ANOVA and then determine whether the data below provide evidence for Theory A, Theory B, or Theory C. In other words, is one theory stronger than the others?
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