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Q1) Number of credit cards carried by students can be modelled by using Poisson distribution. A sample of students generated following data credits cards X 0 1 2 3 4 5 6 students with X credit cards 44 249 388 106 37 12 3. Determine the sample size n, and therefore sample mean Xbar. Use this information to compute a 95% confidence interval for average number of credit cards carried by students.
Q2) Assume you require estimating population proportion p with a 95% confidence interval of total width 0.06. How large must your sample be? If total width is to remain same, but confidence set to 99%, how large must the sample be? If confidence level can be kept at 95%, but total width is to be halved, how large must the sample be?
Create a 95% confidence interval for true mean debt for student borrowers.
A journal polled its readers to determine the proportion of wives who, if given a second chance, would marry their husband again.
Describe the sampling distribution model of this mean.
How large a sample would be necessary to estimate the population proportion with a margin of error of 0.05 at 95% confidence?
Use this information to set up a 90 percent confidence interval for the proportion, p of all US workers who play hooky.
What are the possible combinations of coins that Sanjay could have received in change?
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
The chance both flights are full is 0.6. Are the two flights being full independent events and What was the mean ranking for the females in this class
In a survey conducted to see how long Americans keep their cars, 2000 automobile owners were asked how long they plan to keep their present cars. The results of the survey follow. Find out the probability distribution associated with these data.
Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam.
What is the probability that a simple random sample of 40 male graduates will provide a sample mean within $10,000 of the population mean, $168,000 (to 4 decimals)?
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
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