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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
The distribution of income of families in the US in 1979 (in actual dollars uncorrected for in?ation) is shown in the table below (Prob 4.28):
Fill 'er up! In a recent month, 88% of automobile drivers filled their vehicles with regular gasoline, 2% purchased midgrade gas, and 10% bought premium gas.
A good number of the crimes in in Mesopotamia would be deliberated crimes nowadays.
The following indices: z, t, F, r, Chi square. Using the data below, show that analyses using each of the three statistics yields the same or similar outcomes.
Calculate and examine the standardized residuals. What? pattern, if? any, do they show that would be of interest to retailers concerned about cybershopping?
Show the sampling distribution of if a random sample of 150 insured individuals is used to estimate the proportion having received at least one ticket.
Display the data in a histogram for the weekday greens fees for nine holes of golf. How would you describe the shape of the data?
an american roulette wheel has 38 slots 18 are red 18 are black and 2 are green. let r be the number of spins until you
the verbal part of the graduate record exam has a mean ? of 500 and a standard deviation ? of 100. use the normal
For much of the past decade, online-gaming companies spent millions of dollar developing and releasing massively multiplayer online (MMO) games.
The mean weight of cereal in its 18 ounce boxes is less than 18 ounces. The computer display is shown below. Using a significance level of 0.05, what is your conclusion from these data?
At the Diabetes Institute, patients are classified as compliant (they take their medication as they should) or not (they don't).
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