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A recent national survey found that high school students watched an average (mean) of 7.8 DVDs per month with a population standard deviation of 1.00. A random sample of 30 college students revealed that the mean number of DVDs watched last month was 7.30. At the .05 significance level, can we conclude that college students watch fewer DVDs a month than high school students?
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
a) Value of the test statistic
b) What is the p-value?
Show draw a cause-and-effect diagram to organize the possible causes of delayed flight departures into the following maj categories.
Gestational Age (Gestage, weeks) for sample of 100 low birth weight infants, and output from fitting a simple linear regression model to data, regressing Headcirc (Y) on Gestage (X).
A small New England college has a total of 400 students.The Math SAT is required for admission, and the mean score of all 400 students is 620. The population standard deviation is found to be 60. The formula for a 95% confidence interval yields th..
Determine a random number generator and make simulated data for not more than 25 participants (test subjects) in study using ranges of values for variables you established above.
Formulate a linear programming model for this problem.
The times needed to fall asleep are assumed to follow a normal distribution. The results for the two nights for the ten volunteers are shown below:
Illustrate the maximum number of reservations that it could accept for a flight with a capacity of 160, if it needs the probability of accommodating all reservation holders to be at least 95%.
We want to test the hypothesis that the population variances are equal.
The point estimate for the difference between the proportions is:
Determine SSE, SS (Total) and the explained sum of squared variation SSR and find the estimated y intercept slope and write the regression equation.
Results of study are summarized below. Use a 5% level of significance and test claim that opinion is independent of brand.
This morning the office you are monitoring has eight office visits on the schedule. What is the probability that
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