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Q1) A major credit card company has find out that its customers charge average of $ 280 per month on their accounts with standard deviation o f$20
i) What percentage of customers charges more than $275 per month?
ii) What percentage of customers charges more than $43 per month?
iii) What percentage of customers charges more than $241 an d$301.60 per month?
Q2) A manufacturing process makes items whose weights are normally distributed. It is known that 22.57% of all the items made weigh between 100 grams up to mean and 49.18% weigh from the mean up to 190 grams
a) Find out the mean.
b) Find out the standard deviation.
Suppose that the population of heights of male college students is approximately normally distributed with mean m of 68 inches and standard deviation s of 3.75 inches. A random sample of 16 heights is obtained.
Which statement is true for a statistical study?
Perform hypothesis testing on one variable's data.
Suppose you found that in doing the hypothesis test, you were able to reject the null hypothesis. What is the most appropriate conclusion to draw?
These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:
where p is the binomial probability of returning a completed survey, and log is the natural logarithm. The multiple logistic regression output from fitting this model is given below.
Use this information to compute a 95% confidence interval for average number of credit cards carried by students.
Explain why random samples are preferred to nonrandom samples.
By using this data and incorporating seasonal effects, predict quarterly turnover for 2010.
Obtain the simple linear regression equation, then analyze the residuals by (a) constructing a histogram
At the .05 level of significance, can we conclude that those joining Weight Reducers on average will lose less than 10 pounds? Determine the p-value.
All else being equal, what occurs to your confidence interval when you increase value of alpha?
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