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Question: Should we use t? Determine whether we can safely use a t* critical value to calculate a confidence interval for the population mean in each of the following settings.
(a) We collect data from a random sample of adult residents in a state. Our goal is to estimate the overall percent of adults in the state who are college graduates.
(b) The coach of a college men's basketball team records the resting heart rates of the 15 team members. We use these data to construct a confidence interval for the mean resting heart rate of all male students at this college.
(c) Do teens text more than they call? To find out, an AP® Statistics class at a large high school collected data on the number of text messages and calls sent or received by each of 25 randomly selected students. The Fathom boxplot below displays the difference (texts - calls) for each student.
SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. What percent of test takers score less than 300?
Compute a 95% confidence interval for the population mean, based on the sample numbers 21, 22, 33, 34, 25, 26, and 139. Change the last value to 29 and re-compute the confidence interval
suppose we know grades on final exam in a statistic course are normally distributed with a mean of 72 and standard
Determine a 95% confidence interval for the mean efficiency of a given batch of motors. If we want to cut the confidence interval by 1/3, how many motors should be tested?
In 4-5 paragraphs describe gender roles (how they were influenced/changed) though out middle ages (with specific examples of people, years etc.)
to test the effectiveness of a new drug designed to relieve pain 250 patients were randomly selected and divided into
In a sample of n=60 people who recently received speeding tickets, 38 were older than 25 years and the other 22 were age 25 or younger. Is the age distribution for this sample significantly different from the distribution for the population of li..
Based on this sample, is Moe correct in his assertion? Write up formal commentary of results of your test.
The monthly income of residents of Dayton is normally distributed with a mean of $3000 and a standard deviation of $500.
Explain the difference between the standard error of P^ and the standard deviation of the sampling distribution of P. Write down the formula for each one. Which one is more likely to be used in practice? Why?
A unity feedback system is shown in Figure AP10.5. We want the step response of the system to have an overshoot of about 10% and a settling time (with a 2% criterion) of about 4 seconds.
Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution.
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