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A random sample of smokers was obtained, and each individual was classified both with respect to gender and with respect to the age at which he/she first started smoking. The data in the accompanying table is consistent with summary results reported in the article "Cigarette Tar Yields in Relation to Mortality in the Cancer Prevention Study II Prospective Cohort" (British Med. J., 2004: 72-79).
a. Calculate the proportion of males in each age category, and then do the same for females. Based on these proportions, does it appear that there might be an association between gender and the age at which an individual first smokes?
b. Carry out a test of hypotheses to decide whether there is an association between the two factor
The unit cost of producing a steak dinner at the Smalltown Inn is $6. If a restaurant charges p dollars for a steak dinner, customers will demand 200 - 5p steak dinners per week. To maximize the profit earned on steak dinners, what price should th..
a clinical trial is run to investigate the effectiveness of an experimental drug in reducing preterm delivery to a drug
sample of 100 measurements were taken to analyze concentration of impurities in a product. calculated sample mean was
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
The average avoidable cost for a fringe firm is AAC(q) = 20/q + 5q. The marginal cost function for a fringe firm is MC = 10q. There are 10 fringe firms. The marginal cost of the dominant firm is 2 and the demand function is Q = 100 - P.
Find a 95% confidence interval for the difference between this year and last year in the mean number of units sold at all retail stores and interpret the results.
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A large energy company provides a call centre to answer customers’ queries. The call centre management is keen to understand the activity and performance levels that the call centre has experienced over the last winter and what they might do to impro..
First explore the data using suitable statistics and graphs. Use the results to make informal comparisons. Determine whether there are significant differences between the ages of the Best Actresses and the ages of the Best Actors
because the ta distribution is based on hundreds of students we are willing to regard it as a fixed probability
Test whether the weight reducers on average will lose less than 10 pounds using P-value approach.
1.according to a recent survey 275 of 400 middle-aged americans said they used the internet regularly. 140 of 400
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