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We investigate if a period of time feels longer or shorter when people are bored compared to when they are not bored. Using independent samples, we obtain these estimates of the time period (in minutes):
Sample 1 (bored): X = 14.5, s sub X super 2 = 10.22, n = 28
Sample 2 (not bored): X = 9.0, s sub X super 2 = 14.6, n = 34
(a) What are H0 and Ha? (b) Compute tobt (c) With α = .05, what is tcrit? (d) What should the researcher conclude about this relationship? (e) Compute the confidence interval for the difference between the ?s. (f) Using our two approaches, how important is
find the following probabilities for the standard normal random variable z. we are suppose to use the z table but i am
Gasoline and number of gallons sold. For sample of 14 stations last Tuesday, correlation was 0.83. At 0.05 significance level, is correlation in population greater than zero?
Cholesterol levels for women follow a normal distribution with mean = 185 mg/dL and standard deviation = 50 mg/dL. What percent of women have cholesterol levels above 240?
Suppose 10 smokers are randomly selected and the number of smokers who started to smoke before the age of 18 is recorded. a) explain why this is binomial experiment.
Compute the value of t. What is your decision regarding the null hypothesis?
Over the years, projected due dates for expectant mothers have been notoriously bad at a large metropolitan hospital. The physicians attended an in-service program to develop techniques to improve their projections.
the following table gives the average high temperatures in january and july for several european cities. write a 90
Use the normal-theory method to test for significant differences in 12-month mortality between the two groups.
What is the probability an advertising firm selected at random has either an income between $1 million and $20 million, or an income of $20 million or more?
brake pads in a car need to be changed on after 7 years on average. the cost is normally distributed as n35050.a. what
suppose bolts are being manufactured using a process so that it is known that the length of the bolts follows a normal
due to limited capacity only 200 of these can be made each month on regular time and the cost is 300 each. however an
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