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The average price of regular gasoline in continental US states and District of Columbia was $3.74 on August 18, 2008.
Express the confidence interval .600, .800 in the form p-hat plus and minus E.
Construct a bar chart and a pie chart and a Pareto chart A survey of 705 workers requested how much they used the internet at work.
For the samples summarized below, test the hypothesis at ∞ =.05 that the two variances are equal. Variance Number of data values Sample 1 19 8 Sample 2 9 18.
Explain the standard deviation, range and Z score for given data Using the following sample
Explain the mean, median and mode for the given data Using the subsequent sample
Find out the minimum needed sample size if you want to be 95% confident that sample mean is in two units of true population mean. Suppose that sigma = 7.8 and that the population is normally distri
At a certain university, the average cost of books per student was $400 per student last semester. In a sample of 40 students this semester, their average cost was $430 with a standard deviation of
Explain what is the definition of the 90th percentile? For any distribution the mark that separates the highest 10% from the rest of the scores is called
A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with the standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher t
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Suppose the variable is normally distributed and a
Assume that in a hypothesis test with null hypothesis 0 μ H : = 13.0 at a = 0.05, that a value of 11.0 for the sample mean results in the null hypothesis not being rejected.
Compute value of p based on the expected values. Explain if p is the probability of Event 1 and (1-p) is the probability of Event 2 based on the expected returns for what values of p would you choos
Assume the correlation between height and weight for the adults is +0.70. What percent of variability in weight is predicted by relationship with height?
Paramedics in a large city say they need more staff at night because they get more emergency calls then. A random sample of 7 nights showed that the paramedics received the following numbers o
Assume you have developed a new program to stop teens from smoking. You try the program on high school seniors and then learn how many of them started to smoke. You believe that the prop
Establish what analysis would you do on each problem (i.e, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)? Then state the null and altern
Find out the predicted value of Y given X = 24. Give the interpretation of predicted value in context of the problem. Find out 95 % confidence interval for mean value of Y given X = 24. Give interpre
Determine what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)? Then state the null and alter
Find out what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)? Then state the null and altern
Find out what analysis would you do on each problem (for example one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)? After that state the nul
A home owner claims that the current market value of his house is at least $400,000. Sixteen real estate agents were asked independently to estimate the house's value and 9 supported the homeowners
Let Wt be a wiener process and t denote the time. Is stochastic process Xt - 2Wt +t martingale? Describe.
Patients arrive at emergency room of costa valley Hospital at the average of 5 per day. The demand for emergency room treament at the costa valley follows the poisson distribution.
In a test of the hypothesis that a female flirt at others more than males do, females and male subjects were videotaped while interacting at a conference. All through the conference the number of fl