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It's believed that as many as 25% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group.
a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within 6% with 90% confidence?
b) Suppose we want to cut the margin of error to 4%. What's the necessary sample size?
c) What sample size would produce a margin of error of 3%?
question the student population at the state college consists of 55 females and 45 males.a. the college
The mean number of passengers per flight is 160 with a standard deviation of 20. The aircraft used for the route has 200 seats.
How does a linear regression allow us to better estimate trends, costs, and other factors in complex situations?
To test H0: against the alternative H1: in Q 1.5 above, the degrees of freedom of a suitable t-statistic is: In a study of the effect of oral contraceptives (OCs) on blood pressure, measurements were made on 10 OC users (x) and 14 non-users (y).
It is reasonable to model their weights as independent random variables, find the probability that 100 packages will have a total weight exceeding 1700 lb.
Simple random sample of 100 elements is taken: (a) What is the chance of an element being included in the sample? (b) What is this chance called (hint: not probability)?
according to the coffee research organization the typical american coffee drinker consumes an average of 3.1 cups per
Concrete blocks are to be used in the foundations of several buildings. The specifications state that the minimum arithmetic mean compressive strength of a sample of blocks must be 1,000 pounds per square inch (psi).
At the 0.01 significance level can we conclude that there is a higher proportion of absenteeism among afternoon employees? Compute the value of the test statistic.
At one excavation site 8641 pot shards have been found that not yet been cleaned and identified. What is the probability that:
36 values given here are based on summary statistics from research by cumming. Do you think that these data are normally distributed?
Because the correlation between smoking and marijuana use was .45, the researcher concluded that curette smoking leads to marijuana use. Do you agree with the researcher's conclusion? Explain your answer.
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