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nationwide test taken by high school sophomores and juniors has three sections, each scored on a scale of to . In a recent year, the national mean score for the writing section was , with a standard deviation of . Based on this information, complete the following statements about the distribution of the scores on the writing section for the recent year.
A Variable has a mean of 100 and a standard deviation of 16. Four observations of this variable have a mean of 108 and a sample standard deviation of 12. Test whether the sample has been drawn from the population.
If represents the true average gas mileage for this new model, which of the following gives the null and alternative hypothesis that the CONSUMER group should test?
Construct a 95 percent confidence interval for the difference in proportions for the two populations represented by these samples.
The probability that more than 6 planes arrive in the next minute is _____.
In an effort to estimate the mean amount spent per household per month in a small Canadian town, data were collected for a sample of 50 households. The sample showed an average amount of $2000 and a standard deviation of $500.
What does r 2 of .73 tell us? Is this a strong or weak correlation? How can you tell?
Given that a respondent is over age 50, what is the probability that he or she gets news primarily from newspapers?
The sample standard deviation of the first set of strengths was 8.2 ksi, the second set's S value was 9.8 ksi, and the S value for the 25 differences in strengths was 3.3 ksi.
Scatter plot, Correlation coefficient and Regression equation - Do a complete regression analysis by performing the steps below
A ten year old survey found that the average income of sole proprietor CPA's was $74,914. To update this information, a new survey of 112 proprietor CPA's was taken and it showed a mean of $74,695.
The analogous probability for the second signal is 0.49, and the probability that he must stop at at least one of the two signals is 0.75. What is the probability that he must stop
Calculate the slope and intercept of the least-squares line. (Give the answer to three decimal places.). Compute an estimate of the average runoff volume when rainfall volume is 75.
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