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Twenty students agreed to participate in a new type of learning program to increase their typing efficiency. It was accepted that prior to beginning the new learning process their mean was 60 words per minute. Upon completing the new program, the students' mean was 65 words per minute with a sample standard deviation of 10. Did the learning process help the students increase their typing efficiancy significantly? Assume alpha=0.05
If the population standard deviation is σ = 10, can you conclude that the treatment has a significant effect? Use a two-tailed with α = .05.
Compute the appropriate test statistic to test Ho: p = 80/100 vs. Ha: p > 80/100.
The probability that Luis will pass his statistics test is 0.44. What is the probability that he will fail his statistics test?
in the world series of baseball two teams a and b play a sequence of games against each other and the first team that
A manufacturer claims that fewer than 6% of its fax machines are defective. In a random sample of 97 such fax machines, 4% are defective. Find the P-value for a test of the manufacturer's claim.
Use a 0.05 significance level to test the claim that the mean speed of all cars is greater than the posted speed limit of 70 mph. Based on the above situation compute the value of the test statistic.
In terms of p , the researcher should test which of the following null and alternative hypotheses?
Use these statistics to construct a 94% confidence interval for the mean monthly consumption for the population of all Ontario households.
What are the estimated monthly sales for a particular region with a population of 796,000, per capita income of $6,940, and an unemployment rate of 6.0 percent?
A large energy company provides a call centre to answer customers’ queries. The call centre management is keen to understand the activity and performance levels that the call centre has experienced over the last winter and what they might do to impro..
Let A be the event that a student is enrolled in an accounting course, and let S be the event that a student is enrolled in a statistics course.
Nursing program gives a qualifying exam to students applying for admission. The grades on the exam have a mean score of 80 with a standard deviation of 6. Describe the distribution of grades.
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