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Newspaper headlines recently announced a decline in science scores among high school seniors. In 2000, a total of 15,109 seniors tested by The National Assessment in Education Program (NAEP) scored a mean of 147 points. Four years earlier, 7537 seniors had averaged 150 points.
The standard error of the difference in the mean scores for the two groups was 1.22.
a) Have the science scores declined significantly? Cite appropriate statistical evidence to support your conclusion.
b) The sample size in 2000 was almost double that in 1996. Does this make the results more convincing or less? Explain.
Find the probability that fewer than 5 are satisfied with the airlines. (c)Find the probability that 8 or more are satisfied with the airlines.
A random sample of 50 students from this school was selected, and the mean math SAT score was 530. Is the high school justified in its claim? Explain.
Effective Yield Repeat question 9, but this time assume that Rollins, Inc., expects the 180-day forward rate of the pound to substantially overestimate the spot rate to be realized in 180 days.
Burnwood Tech plans to issue some $60 par preferred stock with a 6% dividend. A similar stock is selling on the market for $70. Burnwood must pay flotation costs of 5% of the issue price.
What is the probability that fewer than 59 CEOs agree that it is attractive to have a joint venture to increase global competitiveness and what is the probability that between 53 and 61 (inclusive) CEOs agree with that assertion?
What is the probability that the cereal would be high calorie? In other words, what is P (high calorie)?
If he were to conduct a second study to reduce the maximum error of estimate to 6, about how many hard drives should he include in his new sample?
A company wishes to test whether the proportion of female managers is the same as the proportion of male managers. The following table provides data for a sample of employees.
Formulate a linear programming model for this investment problem. Define the decision variables. Determine the objective function. What does it represent
At the .05 significance level, can we conclude that the guideline is still reasonable?
a mean guy gave you a nice sample from normal distribution with known variance. so the test should be easy. but he
q1. with random sampling there is homogeneity within a subgroup or stratum.a. judgmental b. simple c. clusterd.
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