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An English teacher believes that there is a relationship between gender and reading ability. He takes a random sample of 90 boys and 75 girls to test this idea. For each sample, he measures their reading ability on a scale of 1 to 20 with higher scores indicating greater ability. The mean score for boys was 7.7 with a standard deviation of 3.1. The mean score for girls was 11.1 with a standard deviation of 3.2. Is there a significant difference between groups? Be sure to state H0, state H1, calculate and state the test statistic, and provide the decision/conclusion statement.
the length of time in seconds that a user views a page on a web site before moving to anotherpage is a lognormal random
With the test statistic you chose, work out the problem with solution using .05 level of significance if it applies.
a nursing school wants to estimate the true mean annual income of its alumni. it randomly samples 120 of its alumni.
for a particular instant lottery the bettor can determine immediately whether a purchased ticket is a winning ticket.
The bank credit card department of Carolina Bank knows from experience that 5 percent of the card holders have had some high school, 15 percent have completed high school, 25 percent have had some college
Explain finding value of test statistic and P-value also understand the result. At the .01 significance level can we compute that the mean fare has increased.
At a certain University, it was found that historically, 10 percent of Ph.D. students fail the program. In a sample of 5 randomly selected Ph.D. Students, find the probability that 3 would fail.
A researcher is interested in estimating noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is required to get the desired information..
Write the hypothesis statement. What distribution are you using?
A microeconomist wants to determine how corporate sales are influenced by capital and wage spending by companies. She proceeds to randomly select 26 large corporations and record information in millions of dollars.
What is the probability that the mean annual precipitation during 49 randomly picked years will be less than 101.8 inches?
What is the 95% confidence interval for the standard deviation of birth weights at County General Hospital, if the standard deviation of the last 25 babies born there was 1.1 pounds.
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