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Researchers at the National Cancer Institute released the results of a study that investigated the effect of weed-killing herbicides on house pets. They examined 827 dogs from homes where an herbicide was used on a regular basis, diagnosing malignant lymphoma in 473 of them. Of the 130 dogs from homes where no herbicides were used, only 19 were found to have lymphoma.
a) What's the standard error of the difference in the two proportions?
b) Construct a 95% confidence interval for this difference.
c) State an appropriate conclusion.
Based on this information, construct the appropriate table of ANOVA summary findings and use the 0.05 level of significance in testing whether all of the treatment effects could be zero.
The data in Table 8.11 were considered by Gentry and Pike (1970) in their study of the relationship between the mean rate of return over the period 1956 through 1969 and the 1969 value of common stock portfolios for 32 life insurance companies.
assume that as a newspaper reporter you must graph data showing that increased smoking causes an increased risk of lung
Set up the appropriate null and alternative hypothesis for testing whether the original sample overestimated the average executive director annual salary.
The probability that the daily demand at this store is at least one and at most three is:
in my office we have 20 men and 35 women. the board of directors is going to appoint four new positions president vice
Select the level of significance, and determine critical, ZCR value.
Forecasting: The sales data for the lone star Sports Apparel Company for the last 12 years are as follows: What is the 2001- 2012 compound growth rate?
A scatterplot shows a set of data points that are clustered close to a line that slopes down to the right. Which of the following values would be closest to the correlation for these data?
a box contains four tickets labeled 0136. the chance that the sample sum of the labels on the tickets in three
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10.
What is the probability that an employee selected at random will need either corrective shoes or major dental work?
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