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A study of college students show that 8 out of 12 students prefer a PC while 4 prefer Mac. Randomly select 2 students with no replacement between selections. Draw a tree diagram and place probabliti
Which of the following statements best describes the meaning of "estimation" in statistics?
The percentage of wins for the Sacamento Kings basketball team going into the playoffs for the 1996-97 season was approximately 75. You need to win four out of seven games to win a playoff round.
Statistical probability is most closely associated with which of the following types of statistics?
Which of the following sampling procedures represents non-probability sampling? The researcher obtains a sample of subjects from his own patient group because they are easy to find.
A simple regression between the walk times and the cholesterol levels has an R2 of 0.98 and the slope of the regression line is 0.7. Would he be justified in concluding that walking slowly may cause
A new screening test for a disease has a sensitivity score of .89. Which of the following statements are true of this test?
Suppose we have a sample of 245 patients who have undergone gastric bypass surgery. Their average weight loss 6 months after surgery is 62 pounds, with a standard deviation of 9.4 pounds. Which of t
Three coins are placed in a box, a quarter and dime and a nickel. One coin is drawn at random. A second coin is drawn at random and then replaced.
Compute sample standard deviation. Construct a 95% CI for the mean number of cups of coffee consumed among all undergraduates.
A random sample of 31 patients with arthritis took the drug for 3 months. Blood test showed that x-bar = 8.1 with sample standard deviation s = 1.9. Use a 5% level of significance to test the claim
In a survey, 600 mothers and fathers were asked about the importance of sports for boys and girls. Of the parents interviewed, 70% said the genders are equal and should have equal opportunities to p
State two ways in which the standard normal distribution and the Student's t-distribution are alike. State two ways in which the standard normal distribution and the Student's t-distribution are diffe
Construct a 98% Confidence Interval for the difference of the proportion between the drug group and the placebo group. Using a significance level of .01, test the claim that the drug is effective us
For a two tailed hypothesis test of a difference of means with α=.05 and df=30, we have the following critical values:
For a hypothesis test of a difference of means with n1=35 and n2=45, what is the value for the degrees of freedom, df?
We estimate the mean price of a cell phone in the Bay Area using a 95% level of confidence. From a random sample of 25 stores the mean price was found to be $150 with a standard deviation of $15
A sample of pieces is taken and the diameters are 1.01, 0.97, 1.03, 1.04, 0.99, 0.98, 0.99, 1.01, and 1.03 centimeters. Find a 99% confidence interval for the mean diameter of pieces from this machi
A UCLA researcher claims that the life span of mice can be extended by as much as 25% when the calories in their food are reduced by approximately 40% from the time they are weaned.
Determine the mean and standard deviation of the variable x in the binomial distribution where n= 4 and ? = .80
A trucking company determined that the distance traveled per truck per year is normally distributed with a mean of 80,000 miles and a standard deviation of 12,000 miles. What proportion of trucks ca
Construct a 95% confidence interval for the population proportion. e. Explain what this confidence interval means. f. By performing the hypothesis test, determine if the survey results support the cla
Draw a tree diagram representing the outcomes of flipping 3 coins with replacement between the flips. List the sample space.
A student is required to take college algebra before taking stats. But not all students are required to take stats. Draw a tree diagram depicting taking algebra and taking statistics.
Three coins are placed in a box. A quarter, a dime and a nickel. One coin is drawn at random and not replaced. A second coin is drawn at random and is replaced.