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There is a sample of 25 boys and a sample of 40 girls. Ten of the boys have read Novel X, and ten of the girls have read Novel X. Use a z-test to see if the proportion of boys who read the novel is different from the proportion of girls who read the novel. You need to calculate the test-statistic, state the critical value, come to a conclusion about the null hypothesis, and state what this means concerning the difference between boys and girls with regard to Novel X. Let it be a two-tailed test where α = .05. You need to explain all your work, numerically where necessary. (This doesn't mean you have to type out exact formulas, but you need to numerically explain all the steps.
A survey showed that 24% of college students read newspapers on a regular basis and that 81% of college students regularly watch the news on TV. The survey also showed that 21% of college students both follow TV news regularly and read newspapers ..
Assuming her grades in different courses are independent, what is the probability she will have at least one sememster with all A's?
1.reading highway signs is not always easy especially if your vision is imperfect. vision in general tends to
(1) In this exercise how would you formulate the null and alternate hypothesis? Is this a one-tailed test, or a two-tailed test? (2) Based on the output, can we conclude at the 5% level of significance that the machine used in shift 1 overcuts the ce..
a. Construct an analysis of variance table for this regression analysis, using the same format as the printout in Exercise 10.17. Be sure to include the sources of variability, the degrees of freedom. the sums of squares, the mean squares, and th..
IQ scores are normally distributed with a mean of 100 and a std dev of 15. If 25 people are randomly selected for an IQ test, find the probably that their mean score is between 95 and 105.
Is 1 significantly low number of adults requiring eyesight? correction?
1. Let X represent the lifetime of a component in a piece of lab equipment, and suppose that X is exponentially distributed with a mean of µ = 1000 hours.
This airplane will be obsolete in 1 year, so all production of the spare part is to take place at present. The production costs now are $1,000 per item-that is, c 1,000-but they become $10,000 per item if they must be supplied at later dates-that ..
what are the expected value and variance of the following probability distribution?random variable
In a city, 28% of new cars were stolen within one year of purchase. Suppose two new cars were randomly selected.
Is the percentage distribution of the opinions of users of the redesigned product different from the percentage distribution of users of this product.
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