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1. In 2001, the US Department of Labor reported the average hourly earnings for US production workers to be $14.32 per hour. A sample of 75 production workers during 2003 showed a sample mean of $14.68 per hour. Assuming the population standard deviation is $1.45, can we conclude that an increase occurred in mean hourly earnings since 2001? Perform a hypothesis test. Use alpha=0.05 .
2. Assume that the average number of hours of watching TV for a week for grade 12 students in a province is 15 hours. A sample of 50 students from ABC High School provided a sample mean of 14.15 hours. The population standard deviation is 3 hours.
(a) Test if the average number of hours spent in watching TV for this high school is different from the provincial average at 0.02 significance level.
(b) Use the confidence interval approach to test the hypothesis in (a).
Can you determine the number of levels used for each factor? Explain. Describe a treatment for this experiment and determine the number of treatments used.
The kinds of statistical methods that were used to formulate the author's argument.
Automobile manufacturers are interested in the difference in reaction times for drivers reacting to traditional incadescent lights and to LED lights.
Four components of a time series are secular trend, cyclical variation, seasonal variation, and irregular variation (Lind, 2005). Briefly describe each of these components and provide a real-world example of one component.
The study does not give sufficient evidence to support the claim that less than 75% of college students spend less than $250 per semester on textbooks.
Enter the data and use the appropriate commands to find the mean, median, mode, sample standard deviation, population standard deviation, 10% trimmed mean, and data count.
Drawing the standard normal curve and indicating the area representing the probability and
Perform a study to compare the characteristics of patients discharged against medical advice from the institution
He argues that the regression effect says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
What kind of correlation do you expect to find between annual income and amount spent on car? Will it be positive or negative?
An automobile insurance company estimates the following loss probabilities for the next year on a $25,000 sports car:
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