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Chapter 7: Q.1.1. (page 437)
About of young adult lnternet users watch online viden. Suppose that a sample survey contacts an SRS of young adult Internet users and calculates the proportion of in this sample who watch online video.
What is the mean of sampling distribution of explain
The required mean is
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The central limit theorem is important in statistics because it allows us to use the Normal distribution to make inferences concerning the population mean
(a) if the sample size is reasonably large (for any population).
(b) if the population is normally distributed and the sample size is reasonably large.
(c) if the population is normally distributed (for any sample size).
(d) if the population is normally distributed and the population variance is known (for any sample size).
(e) if the population size is reasonably large (whether the population distribution is known or not,
According to government data, American children under the age of six live in households with incomes less than the official poverty level. A study of learning in early childhood chooses an SRS of children. Find the probability that more than of the sample is from poverty households. Be sure to check that you can use the Normal approximation.
You work for an advertising agency that is preparing a new television commercial to appeal to women. You have been asked to design an experiment to compare the effectiveness of three versions of the commercial. Each subject will be shown one of the three versions and then asked about her attitude toward the product. You think there may be large differences between women who are employed and those who are not. Because of these differences, you should use
(a) a block design, but not a matched pairs design
(b) a completely randomized design.
(c) a matched pairs design.
(d) a simple random sample.
(e) a stratified random sample.
If we take a simple random sample of size from a population of size , the variability of our estimate will be
(a) much less than the variability for a sample of size from a population of size .
(b) slightly less than the variability for a sample of size from a population of size .
(c) about the same as the variability for a sample of size from a population of size .
(d) slightly greater than the variability for a sample of size from a population of size .
(e) much greater than the variability for a sample of size from a population of size .
The candy machine Suppose a large candy machine has orange candies. Use Figure 7.13 (page 435) to help answer the following questions.
(a) Would you be surprised if a sample of 25 candies from the machine contained 8 orange candies (that's orange)? How about 5 orange candies ( orange)? Explain.
(b) Which is more surprising: getting a sample of 25 candies in which are orange or getting a sample of 50 candies in which are orange? Explain.
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