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1. Your employer asks you to determine whether sales of cars (DV) can be predicted from the GDP (Gross Domestic Product).
What is the appropriate inferential statistical test for the case scenario? Why?
What would be known if the computed statistical result is significant?
2. The director for training at a company that manufactures equipment is interested in determining whether different training methods have an effect on the productivity of assembly line employees. One of his employees who is tasked with testing this assumption randomly assigns 42 recently hired employees into two groups of 21, of which the first receives a computer assisted, individual-based training program and the other receive a team-based training program. Upon completion of the training, the employees are evaluated on the time (in seconds) it took to assemble a part. The results are as follows:
Computer-Assisted, Individual-Based Program
Team-Based Program
19.4 20.7 21.8
22.4 18.7 19.3
14.1 16.1 16.8
15.6 18.0 21.7
14.7 16.5 16.2
30.7 23.7 12.3
16.4 18.5 16.7
16.0 13.8 18.0
19.3 16.8 17.7
20.8 17.1 28.2
19.8 19.3 16.0
20.8 24.7 17.4
17.7 17.4 16.8
20.1 15.2 23.2
The director is an avid proponent of computer-assisted training and asserts even before the research study that the computer-assisted training program will produce better outcomes than the team-based training program.
State the hypotheses for this study (both null and research).
What would the researcher conclude with these data? Assume a significance level of 0.05
What statement can you made by using the rule of three, about the proportion p, of all its computers which are defective?
A year ago, Air Force implemented new test for finding which candidates are most probable to become successful pilots. Now they wish to see if implementing pilot predictor test was a good idea. Scores have been standardized to facilitate comparis..
what size sample should the director choose if she wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99 percent reliability.
Compute the skewness for your data set using Pearson's
Scores on a test are normally distributed with a mean of 60.9 and a standard deviation of 12. Find P81, which separates the bottom 81% from the top 19%.
Below are revenue and profit (both in $ billions) for nine large entertainment companies.
At the .01 significance level, can the manufacturer conclude that the price reduction resulted in an increase in sales?
Given this information, what would sampling error be if sample including seven values in top row were used to calculate sample mean?
What is the best estimate of the average tread life for the entire population of these tires?
Given that both balls selected are white what is the probability that bowl 3 was selected?
At the .05 significance level, can we conclude that the guideline is still reasonable?
From the given research, compare the major players better at batting than 20 years ago using five step hypothesis.
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