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Question: An Ariel Capital Management and Charles Schwab survey addressed the proportion of African Americans and White Americans who have money invested in the stock market. Suppose the file titled Stock race contains data obtained in the surveys. The survey asked 500 African American and 500 White respondents if they personally had money invested in the stock market.
a. Create a contingency table using the data in the file Stock race.
b. Conduct a contingency analysis to determine if the proportion of African Americans differs from the proportion of White Americans who invest in stocks. Use a significance level of 0.05.
Carefully sketch a scatter plot of these data (y versus x1). The relationship does not appear to be linear. Can you describe this relationship between y and x1?
Explain why this model appears to be better than the linear model.- Using the regression analysis above, write an equation of this model.- Interpret the slope of this line.
Given a mean score of 70, standard deviation of 15,percentile of 23.Find the Z score,T score and raw score.
Find a 95% confidence interval for the proportion of all customers who would benefit by purchasing the extended service plan.
The president of the wholesale distributor is concerned about the possibility of stockouts causing a loss of customer confidence and loyalty and is interested in maintaining safety stock in inventory to prevent potential stockouts.
Determine the probability that Allen will be jailed for more than a year.- either Allen or Bill (or both) will be convicted.
Are they are positive/negatively correlated - Are they weak or strong correlations - What is the significance value and what does the significance value reveal about the data we have used?
Evaluate the strength of the relationship by computing the coefficient of determination.
Identify two popular multivitamin formulas and list the ingredients of each. Compare the ingredients with one another. If they are different, why do you think there is a variance between the two?
what is the value for x2left for a 95 confidence interval when n 18?a. 7.564b. 8.672c. 9.390d.
A political strategists believes that less than 55% of voters in a certain state support a particular issue. He then commission s a poll of 500 voters and 54% of them support this issue. If a = .05, is the political strategist's belief warranted
What is the probability that the door will actually open. Supply a probability tree with your solution - what is the probability that the company makes a profit?
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