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Based on data from the 1980 Census the average age of a Na'alehu County, Hawaii resident is 39 years with a standard deviation of 22.6 .
The data is normally distributed.
If 100 residents are surveyed, Determine the Inter Quartile range (IQR) for the average age of the residents of this County. Please explain how you derived your answer:
Sample is found to have a mean of 80.6,a standard deviation of 1.4 test the claim that the true mean of this process is different than 80. use 10% level of significance.
Variance of 4.2 and mean of 23.2 were calculated. Find out 95% confidence interval on mean and standard deviation. Describe any potential problems with this analysis.
Two players roll a fair die 30 times each. What is the probability that each rolls the same number of sixes?
Draw a graph that displays the distribution of Global Sales. Be sure to comment on the distribution. Does it appear normally distributed?
Do you agree? For each of the following statements, comment on whether you agree or disagree. If you disagree, explain why.
The customers arriving between 0 and 1 have to wait until the store opens. Suppose X is the total times that these customers have to wait. Calculate Var(x).
How do you find the z-score corresponding to a score of X = 100 for the distributions given below? How do you know what direction they are going?
Discuss and give examples of three methods that are used in marketing research for determining sample size.
Prepare a table (refer Table 2.6 of the text book) showing in columns Audit Time Intervals (days), Frequencies, Cumulative Frequencies, Relative Frequencies, Cumulative Relative Frequencies, Percent Frequencies, and Cumulative Percent Frequencies
A researcher claims the average American drinks 52 gallons of cola per year with a population standard deviation of 2.0 gallons. We sample 25 random people and find the mean yearly consumption was 49 gallons.
Should you expect to win or loose the expected value in the first game? What can you expect if you play 100 times? Explain (a table will be helpful in finding the required probabilities).
Find the median and the first and third quartiles for the number of CDs owned by senior citizens. Develop a box plot for the information.
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