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A professor was curious as to whether the students in a very large class she was teaching, who turned in their tests first, scored differently from the class mean on the test. The µ on the test was 75 with σ = 10; the scores were approximately normally distributed. The mean score for the first 20 tests was 78. Did the students turning in their tests first score significantly different from the larger mean at the .05 level?
a) Use the four steps of hypothesis testing
b) Illustrate the distributions involved
c) Calculate the 95% confidence interval (*even if nonsignificant result)
Feeling sleepy? The first four students to arrive for a first-period statistics class were asked how much sleep (to the nearest hour) they got last night.
What is the probability of choosing a girl if we are told that the person survived less than one year?
when an opinion poll calls residential telephone numbers at random only 20 of the calls reach a live person. you watch
The management of a supermarket needs to make estimates of the average daily demand for milk.- Assuming that this is a random sample of daily demand, give a 90% confidence interval for average daily demand for milk.
Draw a tree diagram representing the data. What is the probability that a vehicle stolen in this city will never be recovered?
Since the introduction in the UK of the Equal Pay Act in 1970, there has been considerable interest in monitoring the difference between women and men's pay. Official statistics, via the Office of National Statistics (ONS), play an important role ..
Write a brief summary of the distribution of life expectancy.
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Five percent of the respondents gave $25,000 or more to charity over the previous year. Develop a 95% confidence interval for the proportion who gave $25,000 or more to charity.
We randomly pick 100 students. Let represent the proportion of students in this sample who wear contacts. What's the appropriate model for the distribution of?
A researcher hypothesizes that voters who identify themselves as being part of the 'Tea Party' are more likely to believe people have the right to wear guns
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