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1. We ask if the attitudes toward fuel cost of 100 owners are hybrid electric cars (X=76) are different from those on a national survey of owners of non-hybrid cars (µ=65,σx=24). Higher scores indicate a more positive attitude. A) Is this a one or two tailed test? B) In words what is the H0 and Ha? C) Perform the z-test. D) What do you conclude about the attitudes here? E) Report your results in the correct format.
2. We measure the self esteem scores of a sample of statistics students, reasoning that this course may lower their self esteem relative to that of the typical college student (µ=55 and σx=11.35) We obtain these scores:
44 55 39 17 27 38 36 24 36
A) Summarize your sample data. B) Is this a one tailed or two tailed test? Why? C) What are the H0 and Ha? D) Compute zobt E) With α = .05 what is zcrit? F) What should we conclude about the relationship here?
Given following financing project being considered by venture film, determine critical path probability of completion by 17 weeks.
Which component of a time series is most likely to occur? Which component has a pattern that must be complete in a single year and repeat from year to year?
a) yes, because the tst value -3.46 falls in the noncritical region. b) no, because the test value -1.98 falls in the critical region. c) yes, becasue the test value -3.46 falls in the critical region. d) no because the tst value -1.98 falls in the n..
Compute the appropriate test statistic to test Ho: p = 80/100 vs. Ha: p > 80/100.
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
Scores are obtained from the Law School Admission Test (LSAT) are normally distributed with a mean score of 550 and a standard deviation of 110.
A survey of 600 non-fatal accidents showed that 111 involved the use of a cell phone. Find a point estimate for p, the population proportion of accidents that involved the use of a cell phone.
The rest have no opinion. " Suppose that a a sample of 100 American adults is quizzed on the subject. What is the probability of the following events?
Which of the following methods could lead to stronger evidence for the outcome of a nonparametric test?
One table has a standard deviation of $50 while the other has a standard deviation of $150. What conclusion can be drawn from the data?
If we assume all the possible random samples of 250 students at this university, 95 percent of the samples should have means among what two numbers.
Bags of tea are sampled to ensure proper weight. The overall average for samples is 8 ounces. Each sample contains 10 bags. The average range is 0.1 ounces.
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