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1. A pharmaceutical manufacturer has come up with a new drug intended to provide greater headache relief than the old formula. Of 250 patients treated with the previous medication, 130 reported "fast relief from headache pain." Of 200 individuals treated with the new formula, 128 said they got "fast relief." At the 0.05 level, can we conclude that the new formula is better than the old? Using the appropriate statistical table, what is the approximate p-value for this test?
2. In tests of a speed-reading course, it is found that 10 subjects increased their reading speed by an average of 200 words per minute, with a standard deviation of 75 words. At the 0.10 level, does this sample information suggest that the course is really effective in improving reading speed? Using the appropriate statistical table, what is the approximate p-value for this test?
suppose that the hypotheses h0p.35 and hapgt.35 are to be tested. calculate the ovserved z-statistic for the sample
A sample of 70 orders revealed that 57 were delivered in promised time. At .02 significance level, can we conclude that less than 87 percent of orders are delivered in less than 10 minutes?
Whats the most appropriate procedure for evaluating the relationship between tenure and divorce and what is the correlation and how can it be interpreted in terms of magnitude, direction and practical importance?
The general social survey is an annual survey given to about 1,500 U.S. adults selected at random. Each year, the survey contains several questions meant to probe the respondents' views of employment.
A researcher believes that if she uses a different text the students will score differently on the standardized test but she doesn't know what the difference is.
Predict the final grade for a student who studies statistics 8 hours per week (x1), attends 34 classes (x2), and turns in 11 assignments (x3).
Using the 0.01 level of significance, and assuming that a random sample of 200 persons was surveyed from each age group, could the population proportions be equal for those who say they go online daily from the three groups? Source: "Poll Finds Gen..
First interchange the degrees of freedom, and then take the reciprocal of the resulting F value found in Table A-5. Find the critical values FL and FR for two-tailed hypothesis tests based on the following values.
hoping to lure more shoppers downton a city builds a new public parking garage in the central business district. the
at a certain university the average attendance at basketball games has been 2825. this year the attendance for the
Let x1, ..., xn be a random sample from an exponential distribution, X ~ EXP(theta) a) If x(bar) = 17.9 with n = 50, then find a one-sided lower 95% confidence limit for theta.
give two suggestions regarding how a statistician might generate probability estimates when empirical data is
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