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1. Approval rating. A newspaper reports that the gover- nor's approval rating stands at 65%. The article adds that the poll is based on a random sample of 972 adults and has a margin of error of 2.5%. What level of confidence did the pollsters use?
2. Amendment. The Board of Directors of a publicly traded company says that a proposed amendment to their bylaws is likely to win approval in the upcoming election because a poll of 1505 stock owners indicated that 52% would vote in favor. The Board goes on to say that the margin of error for this poll was 3%.
a) Explain why the poll is actually inconclusive.
b) What confidence level did the pollsters use?
What percent of the SAT verbal scores are less than 675? If 1000 SAT verbal scores are randomly selected about how many would you expect to be greater than 575?
a researcher believes exercise reduces anxiety in women. she identifies a group of women who had not exercised before
a sample of 20 of 171 funded projects revealed that 11 were valued at 18000 each and 9 were valued at 20200 each. from
test scores for a statistics class had a mean of 79 with a standard deviation of 4.5. test scores for a calculus class
To estimate the size of the bear population on the Keweenaw Peninsula, conservationists captured, tagged, and released 50 bears. One year later a random sample of 100 bears included only 2 tagged bears.
The Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
describe an alternative to counterbalancing as a means of controlling confounding variables. give an example to back up
A salesperson either makes a sale (S) or does not make a sale (N) with each of two potential customers.The simple events and their probabilities are given below.
Find the area under the normal distribution curve to the right of z = -1.03.
Other questions we might want to ask about pooling similar populations: Do all the subpopulations have the same ratio of yellow to green seeds? Does the average ratio deviate from our hypothesized ratio?
Find the marginal distribution of vehicle type in New York and find the conditional distribution of vehicle type given that the transmission is automatic.
assuming that ssy is constant which of the following correlations would have the smallest ssresidual?please explain
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