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Question: For each of the following, state the null hypothesis and the alternative hypothesis.
a) The publisher of Celebrity Living claims that the mean sales for personality magazines featuring people such as Angelina Jolie or Paris Hilton is at least 1.5 million per week. A sample of 10 comparable titles shows that the mean weekly sales last week were 1.3 million. The publisher's claim is to be verified.
b) The manager of Little Cakes Inc. states that an average of 1500 muffins is sold each week in the retail store. One of the bakers feels that the average is less than 1500, and decides to test this claim.
c) For the past three years, an insurance company has stated that its average claim amount is $2000. The manager feels that this amount should be updated and takes a sample of 55 claims to see if there is a difference in the average claim amount.
d) A machine on a production line is set to automatically fill each bottle with 500 mL of water. The quality control manager regularly takes random samples of the bottles from the production line to ensure that the machine is filling the bottles correctly, If not, the machine will need adjusting.
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05?
For the following, describe the target population, sampling frame, sampling unit and observation unit. Is there any selection bias or inaccuracy of responses?
As a public health personnel, you conducted a survey and collected economic and health data on households in a township that is known to have a high prevalence of heart disease.
Find the probability that you will (a.) make your first sale on your fifth call, (b.) make your sale on the first, second or third call, and (c.)do not make a sale on your first three calls.
Draw the histogram for these data using an initial class boundary of and a class width of . Note that you can add or remove classes.
Suppose nothing in this environment changes. a) Compute the probability the mean number of attacks over the next 10 years is between 500 and 600.
an automotive center keeps tracks of customer complaints received each week. the probability distribution for
Which of the statements about line-balancing is true and if a precedence relationship exists between tasks A and B, they cannot be assigned to the same work station.
If a woman gets a SAT score that is the 67th percentile, find her actual SAT score and her equivalent ACT score. If a woman gets a SAT score of 1220, find her equivalent ACT score.
Commercial A was selected by 45 out of 100 women and 80 out of 140 men. A large-sample 95% confidence interval for this difference is?
Construct a 96% confidence interval for the population proportion when 285 people out of 750 were in favour of boycotting the World Cup matches if prices were to rise above $100 for 64 televised matches.
College students are a major target for advertisements for credit cards. At a university, 65% of students surveyed said they had opened a new credit card account within the past year. If that percentage is accurate, how many students would you exp..
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