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Assuming that these veterans were a simple random sample from the population of all Vietnam veterans, find a 90% confidence interval for the proportion of the population who have been divorced at le
A researcher performs a hypothesis test at the 0.05 level of significance. The null hypothesis is p = 0.85and the alternative hypothesis is p is not equal to 0.85.
You toss a die and your payoff is f(x) = ( 0 if x = 0 x 2 otherwise. What is the optimal strategy and what is your expected winnings if you use the optimal strategy?
Consider a multiple regression model, y = beta_0 + beta_1 * x_1 + beta_2 * x_2 + beta_3 * x_3 to fit these data, which consist of points of the form (x_1, x_2, x_3, y):
Suppose you have a histogram that shows relative frequency. How do you calculate the proportion of the sample that lies between any two of the histogram bars?
Given a Uniform Distribution for a random variable X on the interval 1 to 11. What is the probability for X being greater than 5 and less than 7? What is the probability that X is greater than 6?
Calculate the t-statistic for this problem. How many degrees of freedom for the t-statistic problem have?
Classified ads in a newspaper offered 15 used cars of the same make and model for sale. A regression analysis was performed with the age of the car (in years) as the explanatory variable and the ask
The data show systolic and distolic blood presure of certain people. Find the regression equation, letting the first variable be the independent (x) variable.
A sample of 40 women is obtained, and their heights (in inches) and pulse rates (in beats per minute) are measured. The linear correlation coefficient is 0.238 and the equation of the regression lin
Suppose that X has a Normal distribution, and Y =
Does a baby's sleeping position affect the development of motor skills? In one study, 343 full-term infants were examined at their 4-month checkup for various developmental milestones, such as rolli
A survey is then taken to assess the results of the ad campaign. The results show that 17 percent of the 1000 respondents can identity Cherry-Berry products. Has the advertising campaign increased p
A group of 5 statistics students receive the following grades on a test: 81, 74, 62, 92, and 76. An intervention plan is used and the students increased their scores on a retest to: 85, 79, 75, 95 a
The United Nations released the following annual birth rates and suicide rates
In a random sample of 24 people, the mean number of books they had read in the past year was 14.09 books and the standard deviation was 16.60 books. Assume the variable is normall distribted and use
Score-S-Up is a company that helps students improve their test scores on college entrance exams. They advertise that the study program increases a person's score on the GMAT by an average of 30 poin
Let x-bar1 = 117, x-bar2 = 90, s1 = 10.8, s2 = 11.4, n1 = 50, n2 = 50. Find a 95% confidence interval for the difference in the values of μ. For the following, use 3 decimal places.
A sample of size 21 is taken and a significance test for H0 : u = 0 versus Ha : u doesnt equal 0 is run. The test statistic is t = 1.71. Use 3 decimal places for t values and 2 decimal places for p
The manufacturer of a new line of ink-jet printers would like to include as part of its advertising the number of pages a user can expect from a print cartridge. A sample of 10 cartridges revealed t
Give the appropriate t quantile value, tdf, 1 - a/2, that would be used to construct a confidence interval for the mean of the population in each of the following situations.
Let X be an exponentially distributed random variable such that P( X > 3) = 0.4. Find E(X).
Suppose the doctor would be content with 95% condifence. how does that decrease in confidence affect the sample size required?
Find an online report of a simple research study that includes statistics. You must include website link to the report so that your instructor can access it. Write a brief paper summarizing your un