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1. Suppose we are testing the null hypothesis H0: µ = 50 and the alternative Ha: µ ≠ 50 for a normal population with σ = 6. The 95% confidence interval for the mean is (51.3, 54.7). Then
A. the P -value for the test is greater than 0.05.B. the P -value for the test is less than 0.05.C. the P -value for the test could be greater or less than 0.05. It can't be determined without knowing the sample size.
2. The distribution of times that a company's service technicians take to respond to trouble calls is Normal with mean μ and standard deviation σ = 0.25 hours. The company advertises that its service technicians take an average of no more than 2 hours to respond to trouble calls from customers. From a random sample of 25 trouble calls, the average time service technicians took to respond was 2.10 hours. How strong is the evidence against the company's claim? Based on these data, the P -value of the appropriate test is
A. less than 0.0002.B. 0.0228.C. 0.0456.
3. The times for untrained rats to run a standard maze has a N (65, 15) distribution where the times are measured in seconds. The researchers hope to show that training improves the times. The alternative hypothesis is
A. Ha: µ > 65.B. Ha: x' > 65.C. Ha: µ < 65.
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
Plan the scatter diagram
Which of the following would produce a new confidence interval with smaller width based on these same data and produce a new confidence interval
Use the list of random digits below to assign 4 men and 2 women to the shark fin treatment. Read the table from left to right, first selecting the 4 men and then the 2 women. Use the numerical labels given in the chart to the names.
What is the probability that the mean contents of a six-pack are less than 12 ounces and what is the chance I find at most two defectives in the sample
Find out the probability
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
Solve linear program graphically
Distinct random variable
Conduct a marketing experiment in which students are to taste one of two different brands of soft drink
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
A busy landscaping supplies company sells wood chips for garden mulch. The mulch is sold by the cubic metre and delivered to households in a small truck.
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