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What is the p-value for a sample of 180 undergraduate students with a sample mean credit card balance of $3325?
Given that the doctor makes an incorrect diagnosis, the probability that the patient enters a lawsuit is 0.90. What is the probability that the doctor makes an incorrect diagnosis and the patient sues
Make a histogram. Describe its shape. Predict, based on the shape, the relationship between the mean and median. Find the actual mean and median.
Mean is 100 and SD is 16. Doug has an IQ of 76. What proportion of people have a higher IQ than Doug?
Over what period does the data cover? Are there any missing values for return? If so why? When did the min and max occur? What events occurred in these months that may have caused such an extreme pe
The Cost function of a company depends on an external variable k. Find the value of k so that the fixed cost for the firm is 10000. What would be the variable cost for the company?
The sample mean and sample variance of five data values are, respectively, ¯x =104 and s2 =4. If three of the data values are 102, 100, 105, what are the other two data values?
Download the monthly returns for Freddie Mac from CRSP since August 1, 1989. Make sure you include price, high, low, share volume, return, value-weight return of all stocks with dividends, equal-wei
Without using the formula or calculating any numerical answers, explain why it makes sense that the probability of exactly one error per 1000 pages is a lot more likely than exactly three errors
Test if there is a significant difference in mean systolic blood pressure between groups using = 0.05.
Of 375 randomly selected medical students 30 said that they planned to work in rural community. Find a 95% confidence interval for the true proportion of all medical students who plan to work in a
A clinical trial is planned to compare an experimental medication designed to lower blood pressure to a placebo. Before starting the trial , a pilot study is conducted i
Is there significance evidence of a reduction in total cholesterol level in the children ? Run the appropriate test at the 5% level of significance and assume that the n
The mean number per month is six with a standard deviation of two. Is a Poisson distribution appropriate for this distribution? Please explain.
Is there significance evidence of a reduction in total cholesterol level in the children ? Run the appropriate test at the 5% level of significance and assume that the nu
The variable is age and not at all normal. Is it possible to tell what proportion of people are older than Jim but younger than Jessica? If so, please calculate the number. If not, explain why.
The mean of IQ is 100 and the standard deviation is 16. Sarah is in the 92nd percentile. What is a possible IQ score for Sarah? Assume that IQ is continuous and DO NOT round your answer.
On average, there is one flaw per 1000 feet of pipe. What is the probability that there is exactly one flaw in only 500 feet of pipe?
Bob does not believe his claim, so he takes a sample of 50 employees and finds their average salery is $4.25. Test the managers claim at alpha= 0.02.
An anonymous questionnaire was sent out to 200 texans, and 50 responded that they carry a gun in their car. Is there evidence to support the survey? Let alpha= 0.01.
What would be the appropriate control limits for the x‾chart if the type I error probability were to be 0.01?
The times for the mile run of a large group of male college students are approximately Normal with mean 7.11 minutes and standard deviation 0.74 minutes.
If the process mean shifts to 24, what is the probability of not detecting this shift on the first subsequent sample?
Neither person will wait more than 10 minutes for the other person. If they arrive independently at random times between 5 P.M and 6 P.M, what is the probability that they will meet?