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In a doctor's office there are nine nurses and eight physicians. Six nurses and four physicians are females. If a person is selected from the doctor's office, find the compound probability that the person is a nurse or a female.
Staff
Females
Males
Total
Nurses
6
3
9
Physicians
4
8
10
7
17
on a toss of a fair die a person wins 10 if 1 or 3 results loses 5 if 4 or 6 results wins 5 if 2 results and loses 10
All subjects in the study were questioned about lifestyle factors including alcohol, tea, and coffee consumption. The resulting data are as follows.
Calculate the mean of the 20 samples and draw a histogram showing the 20 sample means and describe the distribution of the x-bars that you see in part b (shape of distribution, center, and the amount of dispersion).
For each, draw the histogram of the sampling distribution of bar(y). Which sampling distribution has the smaller variance, and why?
Estimate the population mean
High temp for January 1st is normally distributed with a mean of 40 degrees and a standard deviation of 5 degrees.
A random sample has been taken from a normal distribution and the following confidence intervals constructed using the same data: (38.02, 61.98) and (39.95, 60.05). What is the value of the sample mean?
Assume Nick doesn't know how his received he suppose that all three states of nature are equally likely to occur. If Nick uses the equally likely criterion illustrate what decision would he make.
consider taking a random sample of size 3 from a population of persons who smoke and recording how many of them if any
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
She samples a group of 100 new fathers and finds that their mean is 64.5. What is the variance on this questionnaire in the general population?
Suppose that 15% of all adults jog. An opinion poll asks a simple random sample of 500 adults if they jog. What is the sampling proportion in the sample who jog?
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