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Different age groups use different media sources for news. A study on this issue explored the use of cell phones for accessing news. The study reported that 47% of users under age 50 and 15% of users age 50 and over accessed news on their cell phones. Suppose that the survey consisted of 1000 users under age 50, of whom 470 accessed news on their cell phones, and 891 users age 50 and over, of whom 134 access news on their cell phones.
Construct a 2 X 2 contingency table. Next, Is there evidence of a significant difference in the proportion that accessed the news on their cell phones between users under age 50 and users 50 years and older? Use a chi-square test to answer this question (5% significance level). Determine the P-value and interpret its meaning
Suppose two dice are rolled. If o is an outcome, let X(o) = the sum of the numbers on the dice. Determine the probability distribution of X.
What are the firm's current capital structure weights for equity and debt respectively?
Suppose a random sample of 50 architects and engineers is selected. How likely is it that the random sample contain five or fewer women in these positions.
A higher-education management consultant wanted to see whether a university computer help desk had sufficient resources to assist faculty with computer.
What was the capital sum of the money invested?
Recall the 68-95-99.9% observation discussed in the "Normal Distribution" section of the textbook that is helpful in answering the question.
A numerical error in preparing his or her income tax return. If 10000 forms are selected at random and examined. Find the probability that 6,7,8, of the forms contain an error.
Suppose that further polling reveals that this WNBA star really is known to about 30% of the target audience. Did the company initially commit a Type I or Type II error in not signing her?
Approximately what percentage of these vineyards are under 60 acres?- Write a brief description of this distribution (shape, center, spread, unusual features).
If she serves 6 times, what is the probability she gets all 6 serves in?- exactly 4 serves in?- at least 4 serves in?- no more than 4 serves in?
To estimate the true proportion of students who abstain from alcohol at LBCC, you will need to take a simple random sample.
Seventy percent of the registered voters in a large community are Democrats.- What is the probability that the constituency of the committee will be no more than 50% Democrats?
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