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A researcher is examining preferences among four new flavors of ice cream. A sample of n = 80 people is obtained. Each person tastes all four flavors and then picks a favorite. The distribution of p
Review the three "Non-parametric" test videos in the Calculations section of the "Statistics Visual Learner" media piece.
According to the Central Limit Theorem, what will happen to the histogram of averages as n increases? Possible answers: a) It depends on the mean and standard deviation b) The histogram will begin t
What is that probability that exactly 5 students smoke? P(X=5)? Calculate the mean, variance and standard deviation for this problem.
Pandora Radio has determined that the probability of a user liking a new song enough to give a "thumbs up" is 0.6138. Given that Pandora plays about 861 new songs per user per month on average, what
Use the normal approximation to binomial to find the probability for n= 48, p= 0.9, and x < 40.
A polling organization interviewed by phone 400 randomly selected fans about their opinion on random drug testing of professional baseball players and found that 68% favored such a regulation. Find
The College of Business at Tech is planning to begin an online MBA program. The initial start-up cost for computing equipment, facilities, course development, and staff recruitment and development i
What is the minimum sample size n required to estimate p with 95% confidence if the desired margin of error D=0.08? The population proportion is estimated as p=0.36 from prior studies.
A simple random sample of 50 items from a population with =6 resulted in a sample mean of 32. Provide a 90% confidence interval for the population mean.
Suppose this estimate is based on a sample of 80 persons and that the sample standard deviation is $550. What is the 95% confidence interval for the population mean amount spent on restaurants and c
A USA Today/CNN/Gallup survey of 369 working parents found 200 who said they spend too little time with their children because of work commitments. What is the point estimate of the proportion of th
Although airline schedules and cost are important factors for business travelers when choosing an airline carrier, a USA Today survey found that business travelers list an airlines frequent flyer pr
Assume that the paired data came from a population that is normally distributed. Construct a 95% confidence interval for the mean of all differences x-y.
Use a significance level of a=0.05 to test the claim that p1=p2. Use the given sample sizes and numbers of successes to find (a) the pooled estimate p, (b) the z statistic, (c) the critical z-values
Identify the type I and type II error that correspond to the given hypothesis. The percentage of adults who have jobs is equal to 88%
Assume the readings on thermometers are normally distributed with a mean of 0 degree C and a standard deviation of 1.00 degree C. Find the probability -1.18 and 0.11
The width of a confidence interval is defined to be the upper bound of the confidence interval minus the lower bound of the confidence interval. For example, if a confidence interval is (-2.34,9.87)
Heights of men on a baseball team have a bell shaped distribution with a mean of 166cm and a standard deveation of 9 cm. Using the empirical rule whats your approximate percentage of men between the
A medical clinic in a small city in the state of Washington wants to estimate the mean serum cholesterol level (measured in mg of cholesterol per 100 mL of blood) of teenage males.
Based on FAA estimates the average age of the fleets of the 10 largest U.S. commercial passenger carriers is 13.4 years with a standard deviation of 1.7 years.
The correlation between the temperature in Celsius and Temperature in Fahrenheit. The correlation between Hours of Sleep before a Math Exam and Exam Score on Math Exam.
A man claims to have extrasensory perception. As a test, a fair coin is flipped 26 times, and the man is asked to predict the outcome in advance. He gets 20 out of 26 correct. What is the probabilit
A politician is concerned with winning an upcoming election. What null hypothesis is he testing if he commits a type I error when he erroneously says that he will win the election?
For the following find the appropriate 95% confidence interval for the corresponding population proportion: