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According to the U.S. Statistical Abstract, the probability of a high school student playing on a sports team was 0.65 for white males, 0.56 for white females, 0.68 for black males, and 0.40 for black females. Assume that the composition of high school students was 0.43 white males, 0.43 white females, 0.07 black males, and 0.07 black females.
a. Was playing on a sports team independent of race and gender group?
b. What was the overall probability of a high school student playing on a sports team?
c. Given that a high school student played on a sports team, what was the probability of being a white male?
The sample has a mean weight of 15.3 pounds and a standard deviation of 1.9 pounds. Create a 95% confidence interval estimate for the true mean weight of all packages received by the parcel service.
The powder diet group had a mean weight loss of 42 pounds with a standard deviation of 12pounds.The liquid diet group had a mean weight loss of 45 pounds with a standard deviation of 14 pounds.
according to a recent survey high school girls average 100 text messages daily the boston globe april 21 2010. assume
The National Association of Realtors (NAR) Existing Home Sales Series provides a measurement of the residential real estate market.
The baggage truck has a mass of 800 kg and is used to pull each of the 300-kg cars. Determine the tension in the couplings at and if the tractive force on the truck is F = 480 N.
It is known that the variance of a population equals 484. A random sample of 81 observations is going to be taken from the population. With a .80 probability, what is the sampling error?
A total of 252 of those receiving surgery, and a total of 270 of those receiving drug therapy were still alive 3 years after treatment. Use these data to test the hypothesis that the survival probabilities are equal.
1) What is the force of attraction between Mars and the satellite? 2) What speed should the satellite have to be in a perfectly circular orbit? 3) How much time does it take the satellite to complete one revolution?
state the hypotheses and identify the claim. compute the test value At a = 0.05, decide if there is enough evidence to reject the claim of no difference in the ages fo the two groups. Compute and use the standard deviations from the samples.
If the manager of a paint supply store wants to estimate, with 95% confidence, the mean life of light bulbs to within +/-20 hours and also assumes that the population standard deviation is 100 hours, how many light bulbs need to be selected?
derive expression of slope at support and deflection at centre of simply supported beam with centre load
A sample of 20 cables is selected and tested. Find the sample mean that will cut off the upper 95% of all samples of size 20 taken from the population.
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