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It was thought that hypnosis would lower a person's desire to smoke. A researcher decided to investigate this hypothesis using a paired-sample sign test in which the number of cigarettes/day smoked by subjects was recorded before and after hypnosis. Given that the critical value for ten samples at a = 0.05 in a one-tailed test is 1, is there enough evidence to support the hypothesis?
Subject 1 2 3 4 5 6 7 8 9 10
Before Hypnosis (Cigarettes/day) 18 20 25 15 19 21 30 16 13 20
After Hypnosis (Cigarettes/day) 16 18 24 10 20 23 26 15 14 18
True or False? Bivariate correlation coefficient always has same sign as b 1 in Y = b 0 + b 1 X.
What is the purpose of sampling? What are some concerns and dangers of sampling? How important is the sample design to data validity? Explain.
A box contains six parts. Two of the parts are defective and four are ok. If three of the six parts are selected from the bin, how large is the sample space?
Suppose 10 balls, numbered 1-10, are to be distributed randomly into 10 boxes. a) What is the probability all 10 balls are placed into one box? b) What is the probability that no boxes are empty?
A survey of the number of calls received by a sample of Southern Phone Company subscribers last week revealed the following information.
A random sample of gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents?
As a part of your proposals. you need to submit demographic information to help demonstrate that the location chosen by the management teams will be a good investment.
Develop a linear regression equation for these data and forecast how much money Robert will win if he spends $30.
A researcher collects data on children's weights from a random sample of children in the South and concludes that children in the South weigh less than the national average.
Assuming that the population standard deviations are the same, perform a two independent samples t-test on the hypotheses Null Hypothesis: μ1 = μ2, Alternative Hypothesis: μ1 ≠ μ2. What is the test statistic and p-value of this test?
Many people attend work and produce little or nothing of value that is why they are terminated.
In a study of human blood types in nonhuman primates, a sample of 71 orangutans were tested and 14 were found to be blood type B. Construct a 95% confidence interval for the population proportion of blood type B in the orangutan population.
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