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2010-05-11 01:21:24

The data presented in the table below resulted from an experiment in which seeds of 5 different types were planted and the number of seeds that germinated within 5 weeks after planting was recorded for each seed type. At the .01 level of significance, is the proportion of seeds that germinate dependent on the seed type? Seed Type Observed Frequencies Germinated Failed to Germinate 1 31 7 2 57 33 3 87 60 4 52 44 5 10 19 A. Yes, because the test value 16.86 is greater than the critical value of 13.28 B. Yes, because the test value 16.86 is less than the critical value of 14.86 C. No, because the test value 16.86 is greater than the critical value of 13.28 D. No, because the test value 13.28 is less than the critical value of 16.86

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2010-05-11 01:21:42#1
the correct option is A
pls help
2010-05-04 00:12:31

Chebyshev's theorem and the empirical rule There is some evidence that, in the years1981-85 , a simple name change resulted in a short-term increase in the price of certain business firms' stocks (relative to the prices of similar stocks). (See D. Horsky and P. Swyngedouw, Does it pay to change your company's name? A stock market perspective, Marketing Science v., pp. .) Suppose that, to test the profitability of name changes in the more recent market (the past five years), we analyze the stock prices of a large sample of corporations shortly after they changed names, and we find that the mean relative increase in stock price was about0.71 %, with a standard deviation of 0.16%. Suppose that this mean and standard deviation apply to the population of all companies that changed names during the past five years. Complete the following statements about the distribution of relative increases in stock price for all companies that changed names during the past five years. a) According to chebyshevs theorm , at least ____ % of the relative increases in stock price lie b/w 0.47% and 0.95% b) According to chebyshevs theorm , at least ____ % of the relative increases in stock price lie b/w0.39% and 1.03%. c) Suppose that the distribution is bell shaped . According to emprical rule , approximately ____ % of the relative increases in stock price lie b/w0.39% and 1.03%. d) Suppose that the distribution is bell shaped . According to emprical rule , approximately 68% of the relative increases in stock price lie b/w0______% and ________%.

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pls help
2010-05-02 23:56:08

10.8) The top food snacks consumed by adults aged 18-54 are gum, chocolate candy, fresh fruit, potato chips, breath mints/candy, ice cream, nuts cookies, bars, yogurt, and crackers. Out of a random sample of 25 men, 15 ranked fresh fruit in their tip five snack choices. Out of a random sample of 32 women, 22 ranked fresh fruit in their top five snack choices. Is there a difference in the proportion of men and women who rank fresh fruit in their top five lists of snacks? (a) State the hypotheses and a decision rule for . (b) Calculate the sample proportions. (c) Find the test statistic and its p-value. What is your conclusion? (d) Is normality assured?(data are from the NPD Group press release, “Fruit # 1 Snack Food Consumed by Kids,” June 16, 2005).

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pls help
2010-05-02 23:55:58

10.3) In 1999, a sample of 200 in-store shoppers showed that 42 paid by debit card. In 2004, a sample of the same size showed that 64 paid by debit card. (a) Formulate appropriate hypotheses to test whether the percentage of debit card shoppers increased. (b) Carry out the tests at . (c) Find the p-value. (d) Test whether normality may be assumed.

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pls help
2010-05-02 23:47:30

9.63 In the Big Ten (the NCAA sports league) a sample showed that only 267 out of 584 freshmen football players graduated within 6 years. (a) At a= .05 does this sample contradict the claim that at least half graduate within 6 years? State your hypotheses and decision rule. (b) Calculate the p-value and interpret it. (c) Do you think the difference is important, as opposed to significant?

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