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To evaluate the success of a 1-year experimental program designed to increase the mathematical achievement of underprivileged high school seniors, a random sample of participants in the program will be selected and their mathematics scores will be compared with the previous year's statewide average of 525 for underprivileged seniors. The researchers want to determine whether the experimental program has increased the mean achievement level over the previous year's statewide average. If alpha = .05, what sample size is needed to have a probability of Type II error of at most .025 if the actual mean is increased to 550? From previous results, s = 80. Suppose a random sample of 100 students is selected yielding y(bar) = 542 and s = 76. Is there sufficient evidence to conclude that the mean mathematics achievement level has been increased? Explain.
The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones
a researcher has developed a new drug designed to reduce blood pressure. in an experiment 21 subjects were assigned
An advantage of the permutation test over the t test for a difference in means is that - distribution interval or a bootstrap percentile interval
the sample standard deviations for two independent samples of size 20 each are 12 and 15. what is the estimate of the
A researcher wishes to estimate within $300 the true average amount of money a country spends on road repairs each year. If she wants to be 90% confident, how large a sample is necessary? The standard deviation is known to be $900.
it has been shown that people drive 5 - 10mph faster than the posted speed limit on a highway. it has been thought that
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A sample of 84 golfers showed that their average score on a particular golf course was 89.05 with a standard deviation of 3.47.
Using the spreadsheet for exercises 1-3, estimate how the population will change from this generation to the next under each of the following conditions.
waiting times to receive food after placing an order at the local subway sandwich shop follow an exponential
a pair of fair dice is thrown. find the probability p that the sum is 10 or greater if label event and sample spacea a
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