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A student was asked to calculate mean and standard deviation for following sample of n _ 5 scores: 81, 87, 89, 86, and 87. To simplify arithmetic, student first subtracted 80 points from each score to get the new sample consisting of 1, 7, 9, 6, and 7. Mean and standard deviation for new sample were then computed to be M _ 6 and s _ 3. Write down the values of mean and standard deviation for original sample?
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial.
The Food King Chain employs more than 3,000 people. The worker's ages are approximately normally distributed, with a mean of 31 years and a standard deviation of 4.3 years.
Drawing on one of your interests in the study of criminal justice, develop three hypotheses that can be tested using t-tests. Why do you think it would be interesting or important to test these hypotheses?
The population of incomes in a particular community is thought to be highly right-skewed with a mean equal to $36,789 and a standard deviation equal to $2,490.
The researcher also gathers data on age and major to see if there is any connection between these varibales and frequency of sexual harassment.
What type of error would result in that case? Respond to at least two of your classmate's postings.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
People in a large population average 60 inches tall. You take a random sample and will be given a dollar for each person in your sample who is over 65 inches tall.
Suppose that the mean amount wagered by all patrons is $287 with a standard deviation of $15. You should give free accomodations to those individuals who wager over how much money?
A professor wants to conduct a study to know whether the grades she gives to her students affect their evaluations of her. She teaches four classes of ten students each.
Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
The Texas Transportation institute at texas A&M university conducted a survey to determine the number of hours per year drivers wasted sitting in traffic. the table below shows the number of hours wasted per year sitting in traffic.
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