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1. A door to door salesperson believes that the probability of making a sale when a person is at home is 0.4 he visits 10 homes. When someone is at home find the probability of making a) exactly 7 sales b) more than 7 sales
2.For a binomial distribution with an n=200 and p=0.3 calculate the probability of obtaining between 50 and 70 successes inclusive in 200 trials .Use the approximation to the binomial .
3.Find the area under the standard normal curve in each case below:
a) below a zscore of 2.5
b) between the z scores of -2.33 and 0.5
c) above the zscore of -1.3
4. A quality control tech is testing the accuracy of a certain type of resistor. He finds that the distribution of resistance is normal with a mean of 14.06 ohms and a standard deviation of 1.73 ohms
A) what is the probability that one of these resistors picked at random will have a resistance of 16 ohms or more?
B) What is the probability that one of these resistors picked at random will have a resistance between 13.06 ohms and 15.06 ohms, inclusive?
Is this correlation statistically significant? He also found the regression coefficient to be -1.66. Is this regression coefficient statistically significant? Explain why or why not for each.
Their initial expenditure would be drilling, which would cost $80,000. If they strike gas, they would have to spend an additional $50,000 to cap the well and provide for the necessary hardware and control equipment.
in a recent survey 344 ceos of medium and large companies were asked whether they had mba degrees. in the sample 97 had
Consider babies born in the "normal" range of 37 - 43 weeks gestational age. Extensive data supports the assumption that for such babies born in the United States, birth weight is normally distributed with mean = 3432 grams and standard devia..
Decrease your sales price by $5 in order to increase sales by 5,000 units. Which of the above alternatives would your choose to increase profits?
the population proportion is .30. what is the probability that a sample proportion will be within .04 of the
Critically discuss some concepts behind variance analysis? Why is it important to test for variances in your data? Explain. How is variance analysis used in health care administration?
using a 5 level of significance and a sample size of 26 what is the critical value for a one-tailed hypothesis
State the null hypothesis and the alternate hypothesis. State the significance level. State the decision rule. Give the formula for the test statistic.
in a survey respondents were asked to indicate their favorite brand of cereal post or kelloggs. they were allowed only
A decision maker is working on a problem that requires her to study the uncertainty surrounding the payoff of an investment. There are three possible levels of payoff -$1,000, $5,000, and $10,000.
use the following table to answer the questions. give your answers correct to two decimal places.x 1 1 3 3
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