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A firm is concerned about the market-share of its products. In the past, about 35% of households used their product. Has this increased? To test this, they set up the following:
H0: p <= 0.35
H1: p > 0.35
To carry out the test at a significance level of 4%, an analyst took a random sample of households (sample size = 80), and found the sample proportion of households that used their product, and it was 28 out of 80. From this, the appropriate Z-stat was computed. What is the critical value for this Z-stat?
A survey covering 0 different suburbs in Dallas found the average price of gasoline to be $3.924 per gallon with a population standard deviation of $0.053. What critical value shoiuld be used to test the claim using a = 0.01?
Draw the scatter graphs for the other pairings in Table 15.2 and come to a decision whether the relationships are linear. Note the pattern-data link.
For those in the Viagra treatment group, find the probability that the subject experienced a headache. Find the risk ratio of a headache for those in the treatment group compared to those in the placebo group. Interpret the result
RETAIL SALES The probability that a shopper in a certain boutique will buy a blouse is .35, that she will buy a pair of pants is .30 and that she will buy.
One owner has offered to let you use his vineyard this year for an experiment. Propose a design. Carefully indicate how you would set up the experiment, specifying the factor(s) and response variable.
question consider the hourly payments of a random sample of employees of a food processing plant given in diagrams
suppose that a person who has recently helped start a company for the first time is randomly selected. the probability
Determine whether the following definitions are stipulative, lexical, precising, theoretical, or persuasive.- "Politician" means a person of unquestioned honesty and integrity whom the people, in their collective wisdom, have duly elected to guide ..
Write the equation of the hypothesized model relating y to x1, x2, x3, and x4.- Conduct a test of overall model utility. Use α = .05.
questionthe table below gives two samples selected from 10 supermarkets of the weekly sales of a popular soft drink.
Find an equation of the least squares regression line. Please show your work. Is there a linear correlation between "x" and "y" at the 0.01 significance level? Please justify your answer.
Discuss potential explanations for the increase in median ROIC and the widening of the distribution of ROICs across all companies over recent decades.
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