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A random sample of size n is to be used to test the null hypothesis that the parameter theta of an exponential population equals thetasub0 against the alternative that it does not equal thetasub0
You decide to test the hypothesis by observing 20 cars with both a man and a woman in the front, and counting how many of those have a man driving.
What is the approximate percentage of girls between 124.4 cm and 125.6 cm? What is the approximate percentage of girls between 124.1 cm and 125.9 cm?
Suppose that the time to failure of a particular part in a system has an exponential distribution with expected time to failure of 5 minutes. Also suppose there is a machine which replaced a failed
a. What is the estimated regression equation? b. Determine if price is significantly related to sales. Use a = 0.10. c. Determine if advertising is significantly related to sales. Use a = 0.10.
You measure the lifetime of a random sample of 64 tires of a certain brand. The sample mean is x = 50 months. Suppose that the lifetimes for tires of this brand follow a normal distribution, with un
The mean symptom score is 74 with a standard deviation of 5.6, and in the placebo group, the mean symptom score is 85 with a standard deviation of 6.0. Is there a difference in mean symptom scores b
Suppose the sample slope measuring the relationship between amount of sleep (x, in hours) and number of yawns by students in 8AM classes (y) for 100 UGA students is computed to be -0.82. From this you
Suppose we rolled a pair of fair dice and count the number of dots located and the face that lands up. Describe this probability distribution. What is the probability of rolling less than a 6.
In exercise 7 a sales manager collected the following data on x=annual sales and y=years of experience. The estimated regression equation for these data is y= 80 + 4x.
The correlation between incidence of pancreatic cancer and alcohol consumption is 0.78 while the correlation between incidence of pancreatic cancer and amount of exerciseis-0.89. From this we can c
The city council of Pine Bluffs is considering increasing the number of police in an effort to reduce crime. Before making a final decision, the council asked the chief of police to survey other cit
Let Xsub1 and Xsub2 constitute a random sample from a normal population with variance= 1. If the null hypothesis
For the independent-measures t statistic, if other factors are held constant, increasing sample variance will _ the chances of a significant t statistic and _ measures of effect size.
If the claim is the alternative hypothesis, and we reject Ho, what should be concluded?
The following graph shows the population of Washington D.C., in 2000 and in 2010. What is wrong with this graph? Draw a graph that depicts the data in a fair and objective way.
According to a government study among adults in the 25- to 34-year age group, the mean amount spent per year on reading and entertainment is $1,896. Assume that the distribution of the amounts spent
What is the probability of selecting a credit card customer at random and finding the customer charged between $74 and $87?
What is the value of the probability density function at x=1, that is fX(1)?
The mean height of 8 year old girls in my daughter's school is 125 cm, with a standard deviation of 0.3, and the height has a bell-shaped distribution. What is the approximate percentage of girls be
According to the most recent Labor Department data, 10.5% of engineers (electrical, mechanical, civil, and industrial) were women. Suppose a random sample of 50 engineers is selected. How likely is
Let B and C be independent random variables, uniformly distributed over [0,7], and [0,3] respectively. What is the probability that both roots of the equation x^2 + Bx + C = 0 are real?
Two points along a straight stick of length 39 cm are randomly selected. The stick is then broken at those two points. Find the probability that all of the resulting pieces have length at least 7 cm
A sample of women were divided into four age groups: Group A (20-45.9), Group B (46.0-55.9), Group C (56.0-65.9), and Group D (66 or older). Information on calcium intake was collected from each wo