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The house of representatives has a very controversial bill that will be going to vote. To help formulate his strategy on how to get the bill passed, the chairman of the committee that has been studying the bill wishes to know if there is a division between Democrats and Republicans on the issue or if there is some other basis for the split. To estimate the proportion of Republicans in favor of the bill, how large must a sample of representatives be to estimate the percentage within 3 percentage points with 90% certainty. Assume there are 538 representatives. Use the finite population correction factor and develop your own formula for computing the answer.
Construct a frequency distribution (class, tally and frequency) for the data set using the indicated number of classes. In the table, include the midpoint, relative frequencies and cumulative frequencies.
For each set of data, calculate mean, median, mode, range, interquartile range, standard deviation, and coefficient of variation.
What is the approximate estimated bootstrap standard error of the median, What is the approximate bias of the median estimated from bootstrapping - What is the bootstrap t confidence interval for the median
If statistically significant, do you think the difference is large enough to be important?
Determine the dependent variable(s)? Determine the value of the statistic? Write down the name of one variable not mentioned in this study that one might wish to control for.
A teacher divides her class into two groups. One group is taught a lesson on the computer and the other is taught by traditional lecture. The teacher then gives a test to see that group has better grades.
The average score of all pro golfers for a particular course has a mean of 70 and a standard deviation of 3.0. Assume 36 golfers played the course today. Find the probability that the average score of the 36 golfers exceeded 71.
Which of the following statements isn't a property of the normal probability distribution? Please explain briefly why
Multiple choice questions based on F-distribution.
A simple random sample of 1000 Americans found that 61% were satisfied with the service provided by the dealer from which they bought their car.
Which are likely to be independent events? For those you think are not, suggest reasons why.
Show the graph of the probability density function for flight time.
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