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To find the necessary sample size for a given level of confidence and accuracy of measurement.
My mgr needs information. I need to determine if a new product is worth marketing. At least 85 percent of the public must express interest in the product and for those that do the average cost they are willing to pay must be at least $47.50.
I survey 50 potential consumers regarding their interest in the product, 34 express an interest in purchasing it. The maximum price each would be willing to pay is shown below.
Maximum Prices
47
62
46
43
53
34
54
45
35
65
36
32
31
25
38
37
56
48
42
63
How large should the sample be if I want to maintain a 95 percent level of confidence and suffer a maximum error of $2.00 in my estimate of the highest price consumers are willing to pay?
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
Probability depends on normal distribution. If a random sample of nine 18 year old men is selected illustrate what is the probability that the mean height
Developing the histogram and pie chart for the sample data.
You are considering adding a new food product to your store for resale. Explain how many units of the new product should be purchased for resale.
If you draw one ball from the urn what is the probability that it is blue or white?
Is the sample size large enough to construct a valid confidence interval for the proportion of debit cardholders who have used their card in making purchases over the Internet?
If one person is selected at random, what is the probability that person is Female?
Here are fifty observations on the weight of tea bags. Calculate the Standard Deviation and Variance.
The researchers planned to use simple linear regression to see if the age at which a baby was first able to crawl could be predicted from the average outdoor temperature six months after each baby's birthdate.
Follow the conventions as described in the general guidelines for writing up Special Problems.
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
Determine expected cell counts if null hypothesis is true and show them in a two-way table. Determine the chi-square() statistic?
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