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Chickenpox, Part II. We learned in Exercise 3.26 that about 90% of American adults had chickenpox before adulthood. We now consider a random sample of 120 American adults.
(a) How many people in this sample would you expect to have had chickenpox in their childhood? And with what standard deviation?
(b) Would you be surprised if there were 105 people who have had chickenpox in their childhood?
(c) What is the probability that 105 or fewer people in this sample have had chickenpox in their childhood? How does this probability relate to your answer to part (b)?
Assuming that this procedure yields a binomial distribution, find the mean and the standard deviation for the number of households in this sample who have cable TV.
If the expected frequency in a cell happens to be less than 5.0, what should be done in order to carry out the analysis?
Consider the ten values 3, 6, 8, 12, 23, 26, 37, 42, 49, 63. The mean is X¯ = 26.9. What is the mean if 63 is increased to 1,000?
To accomplish this goal, perform the following operations on the attached Excel data: Calculate the average Quiz Score [i.e. (points earned)/(points available)] for each student and Calculate the average Lab Report Score [i.e. (points earned)/(points..
In a study of dummy foal syndrome, the average time between birth and onset of noticeable symptoms in a sample of six foals was 18.6 hours.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
The design tolerance thickness for an automotive part is 55 mm to 65 mm. If the process mean thickness is 61 with a standard deviation of 2.3 mm, then what percentage of the sheets will be acceptable? (i.e. What percentage will fall within the des..
Use descriptive statistics to summarize the data from the two studies. What are your preliminary observations about the depression scores?
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In a shipment of 71 vials, only 13 do not have hairline cracks. If you randomly select 2 vials from the shipment, what is the probability that none of the 2 vials have hairline cracks?
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1.an experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield.
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