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Transport trade association conducted a survey of their members to determine what they felt were the important issues to be discussed with the management. The survey results showed that 74% felt that the job security was the important issue, while 65% felt that salary increment was an important issue. Of those who felt salary increment was an important issue, 60% also felt that job security was an important issue.
i. What percentage of the members felt that both job security and salary increment were important?
ii. What percentage of the members felt that at least one of these two issues was important?
What is regression to the mean, and why is it a threat to the validity of research designs in which random assignment has not been used?
What are 6 Examples of communication presentation topics that students should learn about?
A random sample of 100 items is selected from a population of size 350. What is the probability that the sample mean will exceed 200 if the population mean?
Mice populations rise and fall with the abundance of acorns, their favored food. Experimenters studied two similar forest areas in a year when the acorn crop failed.
What is the probability that the sample average will be between $30.00 and $31.00?
Why is it important that statistical research follow ethical guidelines?
Assume that an advertiser wants to verify that 30% share value by conducting its own survey, and a pilot survey begins with 10 households having TV sets in use at the time of a Lindsay and Tobias broadcast.
several Measures of Central Tendency (averages). We usually use the mean. Where would we use other measures, such as the mode or the median?
What is the shape of the theoretical sampling distribution of the mean for samples of (a) 10 if the parent population is normal? (b) 50 if the parent population is not normal?
Draw the histogram for these data using an initial class boundary of 29.5 and a class width of 6. Note that you can add or remove classes from the figure
the kirschner company has a contract to produce garden hoses for a customer. kirschner has 5 different machines that
An experiment is conducted comparing the effectiveness of a new method of teaching algebra for eighth-grade students. Twelve gifted and 12 regular students are taught using this method. Their scores on a ?nal exam are shown in the following table.
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