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Question: Two sisters attend different universities. Each is sure that she has to compete with brighter students than her sister. They decide to settle their disagreement by comparing ACT admission scores of freshmen at the two schools. Suppose they bring you the following data and ask for an analysis. The N's represent all freshmen for one year.
The U. State U.
X¯ 23.4 23.5
s^ 3 3
N 8000 8000
The sisters agree to a significance level of .05. Begin by deciding whether to use a one-tailed or a two-tailed test. Calculate a t test and interpret your results. Be sure to carry several decimal places in your work on this problem.
in a normal distribution of scores four participants obtained the following deviation scores 1 - 2 5 and - 10.a which
The project requires you forecast the historical data, replicating the appropriate trends, seasonalities, week-over-week variability, etc. Please refer to the chapter and materials on Forecasting for the procedures to do.
Calculate the maximum bending stress in a W530×101 steel beam that spans 13 m on simple supports and supports two equal concentrated loads of 54 kN each.
Why do we use N- 1 in the denominator for computing s but use N in the denominator for determining σ?
Suppose you have a confidence interval based on a sample of size n. Using the same level of confidence, how large a sample is required to produce an interval.
the irs was interested in the number of individual tax forms prepared by small accounting firms. the irs randomly
How large a sample is needed to estimate the true proportion of covered children with 90% confidence with a confidence interval of .05.
let xi be a random variable distributed normal mean i amp variance i2. assume that the random variables x1 x2 and x3
3 cards are randomly selected without replacement from an ordinary deck of 52 playing cards. Compute the conditional probability that the first card selected is a spade, given that the second and third cards are spades.
we have given the number of successes and the sample size for a simple random sample from a population. in each case do
suppose the coach of the football team wants to estimate the proportion of the population of fans who support his
your price per unit (P), and the number of units (U) sold, you can use a mathematical equation to determine your net income (NI). In this case the formula is: NI = [U * (P-VCu)] - FC.
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