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The following scores are from a 4 x 10 yard shuttle-run test for a group of middle school students. The scores are measured in seconds to the nearest tenth of a second.
Raw Data: 12.1 12.9 13.1 13.6 15.4 12.2 12.3 11.9 11.8 10.4 10.8 13.0 9.3 11.4 13.8 11.8 10.9 13.4 12.7 10.8 14.8 15.9 11.0 11.17 14.2 12.9 10.3 9.8 12.0 13.1 14.7 11.8 10.5 11.7 9.6 12.1 14.4 15.3 12.1 10.3 11.2 11.4 10.1 11.1 13.4 12.6 9.1 13.0 12.6 12.7 11.9 10.4 11.6 12.5 13.2 13.3 11.5 10.6 12.3 12.9 13.5 12.8 11.6 12.8 12.5 12.0 12.4 14.6 12.8 12.4 13.6 11.7
1. Determine the highest and lowest scores and calculate the range.
2. Determine an appropriate interval size (i) for grouping data.
3. Draw a frequency polygon from the data. Are the data normal or skewed?
When the effect of a level for one factor depends on which level of the other factor is present, use: Select one:
Find a 95% confidence interval for the mean amount of money µ spent at the waiter's tables.
An analysis of variance was used to evaluate the mean differences from a repeated-measures research study. The results were reported as F(3,24)=6.40.
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
The president of Doerman Distributors, Inc., believes that 34% of the firm's orders come from first-time customers. A simple random sample of 120 orders will be used to estimate the proportion of first-time customers
Calculate the mean, mode and median of the grouped data derived from the frequency distribution above. Compare the results obtained from
Each year the local country club sponsors a tennis tournament. Play starts with 128 participants. During each round, half of the players are eliminated.
The amount of time ships spend at the Philadelphia dockyard follows an exponential distribution and the average time spent in the dockyard is 3.1 days.
Four students riding to school together offer a the excuse of a flat tire on their car for missing a test. On the makeup test, the professor asks the students to each identify the tire that went flat.
Agricultural researchers are studying three different ways of planting peanuts to determine whether significantly different levels of production yield will result.
A normal population has a mean of 80.0 and a standard deviation of 14.0. Compute the probability of a value between 75.0 and 90.0.
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.
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