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CRA,CD's, Inc., wants the mean lenghts of the "cuts" on a CD to be 135 seconds (e minutes and 15 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10 minute segment. Assume the distribution of the length of the cuts follows the normal distribution witha population standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CD's sold by CRA CD's Inc.?
a) what can we say about the shape of the distribution of the sample mean?b) what is the standard error of the mean?c) what percent of the sample means will be greater thatn 140 seconds?d) what percent of the sample means will be greater than 128 seconds?e) what percent of the sample means will be greater than 128 but less than 140 seconds?
A researcher discovers the number of parking tickets that a group of students have received during their driving careers. Twenty students reply and they have received between 9 and 20 parking tickets.
Use the steps of hypothesis testing; (b) figure the effect size for the study; And (c) explain your answers to parts (a) and (b) to someone who has never had A course in statistics.
A random sample of 49 employees took a computer literacy test. The sample resulted in a mean score of 75 with a standard deviation of 21. Develop an approximate 95% confidence interval for the population mean of the 600 employees.
In a study of the consumer's view of the economy, the probability that a consumer would buy a house during the year was 0.0013, and the probability that the consumer would buy a car during the year was 0.198. There was also a 0.0100 probability t..
Chi square compares actual data with expected data. What would the expected data be? For example, if I know the percentage of brown M&Ms in a bag is 40% set by the company
The researchers planned to use simple linear regression to see if the age at which a baby was first able to crawl could be predicted from the average outdoor temperature six months after each baby's birthdate.
Can the binomial distribution be used to model the number of rare events that occur over a given time period?
Determine the value of the finite population correction factor if population size is 1000 and the sample size is 300? What is the smallest sample size for which finite population correction factor must be Used?
What is the difference between calculating a confidence interval on the mean vs calculating the confidence interval on a proportion?
If the weekly average expenditure of all households is $53,000 but an expert argues that the weekly expenditure is more than $53,000, test his claim at a 5% level of significance and interpret your results.
Determine the sum of these probabilities , and why is the number less than 1
CD Camera produces a new camera that it claims can take an average of more than 7 photographs per second. A test of 36 randomly selected cameras yielded the following sample values:
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