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Five people are on a diet reduction plan. Estimate the regression for the relationship between the number of pounds of weight lost and the number of weeks each of the five people were on the plan. T
A machine that cuts corks for wine bottles operates in such a way that the distribution of the diameter of the corks produced is well approximated by a normal distribution with mean 3 cm and standar
The company must choose how many hours they should contract with each worker to meet their production requirements and minimize labor cost. Formulate this as a linear programming problem.
The probability of a student is a Physics major at a certain college is 15%
An opinion poll asks an SRS of 100 college seniors how they view their job prospects. In all, 53 say "Good." The plus four 98% confidence interval for estimating the proportion of all college senior
Identify the populations and parameters of interest. Then state hypotheses. State and verify conditions for carrying out a significance test. Calculate the test statistic and the P-value.
A student in the concrete lab, places 6 low strength concrete test cylinders (3500 psi) with a batch of 9 high strength conrete test cylinders (8000 psi): (show all calculations)
Ten voters are randomly selected and asked if they will vote for the incumbent President. Five said yes and three said no. Two students are randomly selected with no replacement between the selectio
Determine the sample size needed to calculate a 95% confidence interval for a proportion with a margin or error of 10%.
Efficacy of a drug. Seventy-five (75) people with hypertension were given a new drug for the treatment of their condition. Blood pressure was lowered sufficiently to reduce the risk of serious outc
There are two major types of regression analysis-simple and multiple regression analysis. Both types consist of dependent and independent variables. Simple linear regression has two variables-depen
Four out of every 10 online homes in the U.S. have switched to broadband high-speed internet. Two homes are randomly selected with no replacement between draws. Draw a tree diagram of the two draws
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