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Suppose your firm had planned a major research study for November 2001. Given the incidents of September 11, your superior decides to add a question to the study. The question must measure consumers' confidence that the U.S. economic system will be able to rebound following the recession of 2009-2010. Create a scale of each of the following types:
a Constant-sum scale
b Likert-type summated scale
c Semantic differential scale
d Stapel scale
e Forced ranking scale
Simple random sample from the students in the university. Find the probability that the average number of study hours for this group is between 21 and 23 hours.
Is there any statistically significant difference in how the drugs perform? If so, explain the effect. Use the post hoc tests as needed.
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
If the class does well on an exam, then the next exam is equally likely to be any of the three types. If the class does badly, then the next exam is always type 1. What proportion of exams are type 1, 2, and 3?
I believe this can be done by plotting out every 3 years average number of people working past 65 since 1997 until now and then making a predictability study as to number of people who will be working over the age of 65 in 2012.
I want to estimate within $10 the mean salary of all graduates who were business majors in college. How many business majors would be needed to estimate the mean salary to within 10 with 95% confidence if the population standard deviation is $200.
Construct a binomial distribution chart and table showing all of the outcomes if a woman would like to know all possible outcomes of having 3 children. Also show this using a probability tree diagram.
Eight randomly selected plants have heights 172, 156, 154, 163, 170, 169, 170 and 164 cms. Test whether the sample standard deviation differs significantly?
How much do typical employee and his or her family spends per year on dental expenses? Sample of 45 employee reveals mean amount spend last year was $1,820, with standard deviation of $ 660.
Generate a relative frequency histogram using ten-point intervals to show the distribution of the scores.
A histogram of time spent eating & drinking each day is skewed right. Use this result to explain why a large sample size is needed to construct a confidence interval for the mean time spent eating & drinking each day.
The lifetime of a color television picture tube is normally distributed with the mean of 7.8 years and a standard deviation of 3 years.
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