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In a recent study of 86 working adults, the mean number of hours per week spent talking on the phone was 21.6. The sd= 5.7 hours.
Calculate the 90% confidence level for the mean.
The format for writing a confidence interval is (xx.x, xx.x)
Find the 99% confidence interval for the population proportion.
For following two regressions describe and interpret major parts from regression output. write down the difference between two regressions?
The length of a particular telemarketing phone call has an exponential distribution with a mean equal to 1.5 minutes. Find the probability that the length of a randomly selected call will be between 30 - 50 minutes and 1 minuter or longer.
What is the probability that at least three students choose Supreme Chocolate?
Between what two values does the P -value of this test fall?
Develop the "best" regression model possible using this set of variables to help you predict the Risk. State your final model. Interpret the coefficients for the model (i.e. what do the numbers mean?). Finally, tell me how to use this model for pr..
An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings.
Probability using Z-score.Find the probabilities that a random variable Z having a standard normal distribution will take on a value.
At 0.05 level of significance, is there enough evidence to conclude that difference exists between proportion of students who have ear infections at one school and the other?
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated? Why might a driver be tempted not to use a seat belt "just on thi..
Draw a scatter diagram of the following bivariate data.
There are two telephone lines A and B. Let E1 be the event that line A is being used and E2 be the event that line B is being used
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