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Using the full 5-step process test to see if a population mean is not 25. Sample data is: Mean 24, standard deviation 10 and a sample of 400 was taken.
What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 5 of µ? Use the value 20 for the population standard deviation of scores on this subsection.
Assume the probability that a person has the desease is 0.08 for all people, independently of each other. Compute the total expected number of tests necessary.
Research by the Illinois Banking Company revealed that only 10 percent of their customers wait more than five minutes to do their banking. Management considers this reasonable and will not add more tellers unless the proportion becomes larger than..
For a random sample of 12 days at the Downtown location, the mean number sold was 78.80 and the standard deviation was 14.25. At the .05 significance level, is there a difference in the mean number of hamburgers sold at the two locations?
What sampling method is best suited for such a survey? Why? Draw the sample using the random number table and bring out the rationale of the procedure. Limit your sample to 25 persons.
Let A and B be two events such that P (A) = 0.6, P (B) = 0.4, P (AB) = 0.2. (a) What is the probability that neither of the two events occurs.
The following sample data were obtained from three populations where the variances were not equal, and you wish to compare the populations.
How did you think that your sample would compare to the national mean? This is your hypothesis. State either the alternate or null hypothesis and identify which one you are stating.
The interpretation of natural logarithms and common logarithms
For an independent-measures ANOVA comparing three treatments with a sample of n = 5 in each treatment, what is the critical value for the F-ratio using a = .05?
If the researcher used an independent-measures design, then how many individuals were needed for the study and what are the df values for the F ratio?
Home mortgage interest rates for 30-year fixed rate loans vary throughout the country. During the summer 2000, data available from various parts of the country suggested that the standard deviation of the interest rates
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