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The starting salaries of individuals with an MBA degree are normally distributed with a mean of $40,000 and a standard deviation of $5,000.
A college is located in the geographic center of mainland United States. The admission officer examines the east-west distance of the college
If you randomly assign participants to groups, can you assume the groups are equivalent at the beginning of the study? At the end? Why or why not?
Would the data for number of murders by those convicted of the crime be an example of a floor or ceiling effect?
Ms. Renner of the Children First Independent School District collects data on a sample of 30 middle school students to evaluate whether the proportion.
The lifetimes of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours.
A large population of overdue bills has balances that follow a normal curve. When we take a sample of 100 of these the average is $500 and the SD is $100.
Was it well-written and clear to those who may not have as much background in the content area or in statistical design?
In a statistic class, 10 scores were randomly selected with the following results were obtained (mean=71.5): 74, 73, 77, 77, 71, 68, 65, 77, 67, 66.
One of the biggest issues facing e-retailers is the ability to turn browsers into buyers.
Explain and give examples of how the particular outcomes of a study can suggest if a particular threat is likely to have been present.
Why did you select this particular method for your research study? What do you like and dislike about this method?
Use the per-barrel oil price data provided above to create a line chart using Excel that plots both prices.
Mary is planning a study to see if learning of 6th graders on a math lesson is affected by background noise level.
A survey of shoppers is planned to determine what percentage use credit cards. Prior surveys suggest that 59% use credit cards.
If no a priori guess of the proportion was available, what sample size should be used? Why is this sample size larger than that found in part (a)?
Hockey-r-us" a store specializing in sales of hockey equipment, wants to find out the average age of all it's customers.
Assume there are 538 representatives. Use the finite population correction factor and develop your own formula for computing the answer.
Why is it important to determine an appropriate sample size and how can you determine what sample size you should use to ensure that your population mean.
He estimates the standard deviation to be 15. If he wishes to be 95% certain of having enough plants, how large a sample must he take to be within 5 plants?
Determine the probability that the sample proportion will be within ± .03 of the population proportion if a sample of size 500 is selected.
Find the appropriate minimum sample size: You want to be 95% confident that the sample variance is within 40% of the population variance.
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level.
If the poll is to have a 98 percent confidence interval and must be within four percentage points, how many people should be surveyed?
Five machines produce electronic components. The number of components produced per hour is normally distributed with a mean of 25 and a standard deviation of 4.