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Langewitz, Izakovic and Wyler (2005) reported that self-hypnosis can significantly reduce hay fever symptoms. Patients with moderate to severe allergic reactions were trained to focus their minds on specific locations where their allergies do not bother them, such as a beach or ski resort. In a sample of 64 patients who received this training, suppose that 47 showed reduced allergic reactions and 17 showed an increase in allergic reactions. Are these results sufficient to conclude that the self-hypnosis has a significant effect? Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use an alpha of .05."
The simple random sample is n = 14, σ = 12.5 and the original population is normally distributed.
If the company's report is correct, what is the probability that the average balance of an account in the sample is $383 or less?
In a nationwide survey of n = 1,030 adults, 6% answered yes to the question "During the last year did anyone break into or somehow illegally get into your home or apartment?"
Use a 5% significance level to test the claim that there appears to be a difference in the effectiveness of the two diets.
Suppose that p = P(female birth) = 0.5. A couple wishes to have exactly one female child in their family. They will have children until they have a girl, then they will stop having children. What is the probability that the family has three childre..
The average age of the women was 36.97 with a standard deviation of 8.893. If a 95% confidence interval is calculated to estimate the difference between the two average ages, what is the margin of error? Assume both population standard deviations ..
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? Compute the value of the test statistic.
Height of men have a mean of 69.6 inches and standard Dev of 2.8 inches. If 64 men are randomly seleted, find the probabilty that they have a mean greater than 70.6 inches.
Critically illustrate out the range? What is the arithmetic mean income? What is the population variance?
Suppose you take a sample of size 100 of test scores and find that the mean is 63. What is the z-score corresponding to this sample mean?
Professor Jennings claims that 35% of the students at Flora College work while attending school. Dean Renata thinks that the professor has underestimated the number of students with part time or full time jobs. A random sample of 81 students shows..
The average age of the students in the sample was 23 with a standard deviation of 3.5: a) Formulate the hypotheses for this problem.
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