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1. An instructor wanted to construct a confidence interval for the mean GPA of the students in his class. He used the campus records system to obtain their GPA's and computed the 95% interval as (2.32, 2.87). If he wants to use this interval to describe the students in his class,
A. he's 95% confident the interval contains the real average GPA.B. there's a 5% chance the interval is wrong.C. he didn't need an interval after all.
2. A student curious about the average number of chocolate chips in a commercial brand of cookie estimated the standard deviation to be 8. If he wants to be 99% confident in his results, how many chocolate chip cookies will he need to sample to estimate the mean to within 2?
A. 11B. 107C. 62
3. A student wanted to estimate the number of chocolate chips in a commercial brand of cookie. He sampled 100 cookies and found an average of 10.5 chips per cookie. If we assume the standard deviation is 8, what is a 99% confidence interval for the average number of chips per cookie?
A. (8.4, 12.6)B. (8.9, 12.1)C. (5.3, 10.7)
A quality control inspector selects a part to be tested. The part is then declared acceptable, repairable, or scrapped. Then another part is tested. List the possible outcomes of this experiment regarding two parts.
Compute the probability of a successful operation (i.e., an operation in which at least one hit is a success) if all 3 missiles are launched and a hit within 40 miles of the target is considered a success.
The "average" (mean) tire wore out at 41,000 miles, and the standard deviation was 4000 miles. Approximately what percent of the tires are likely to wear out before 40,200 miles?
A bar chart to illustrate the differences. What type of statistics was shown? What activities did the newspaper use to make the report?
On a graph, the vertical difference between the observed and predicted values of the response variable for an individual is called the
A fast food arrives at a fast drive through rest restaurant 6 minutes after it opens and then the arrival times for the next four customers in order are 3minutes, 8 minutes, 2 minute, and 5minutes.
Binomial distribution to find out the mean also standard deviation. Variance and standard deviation of a lot of 300 calculators.
A random sample of 16 federal inmates is selected. What is the probability that exactly 12 are serving time for drug dealing?
Leading product are falling leading to declining revenues. Draft a research proposal for the client based on a scientific methodology.
Plot CEO salaries against the net profit of their respective companies, do you expect to find a linear correlation between the two? Explain.
You randomly select 425 students and ask each one what the top motivation is for using a credit card. Can you conclude that there has been a chagne in the claimed or expected distribution? Use a =0.025.
Determine the best replacement policy over the next five years?
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