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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
Relatively speaking, who performed better on the test, you, with an 86, or your friend? Why?
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
Has the average community level of suspended particles for the month of August exceeded 30u/m3?
A study published in the New England Journal of Medicine (Aug. 2001) suggests that it's dangerous to enter a hospital on a weekend. During a 10-year period, researchers tracked over 4 million emergency admissions to hospitals in Ontario, Canada. T..
Compute the incidence proportion or the risk ratio that compares group 1 to group 0, and compute the Incidence proportion or the risk ratio which compares group 2 to group 0. Then post a summary of your findings.
If the sales are $150,000 per month, determine how much the company can expect to receive of this amount.
Compute the value of z and state your decision regarding the null hypothesis.
Five test vehicles of each kind were crashed, with results given below. Research question: Are mean crash damages the same for these 3 vehicles?
What is Peter's median grade point at graduation? What is the shape of the grade point distribution?
Consider the following estimated regression equation, based on 10 observations.
If a worker is chosen at random, what is the probability that he or she.Is very improbable to switch jobs. Is somewhat likely or very likely to switch jobs.
Standard deviations for first- and second-time and confidence interval
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