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A nationwide test taken by high school sophomores and juniors has three sections, each scored on a scale of 20 to 80. In a recent year, the national mean score for the writing section was 51.7 , with a standard deviation of 10.9. Based on this information, complete the following statements about the distribution of the scores on the writing section for the recent year.
(a) According to Chebyshev's theorem, at least ?56%75%84%89% of the scores lie between 24.45 and 78.95.
(b) According to Chebyshev's theorem, at least ?56%75%84%89% of the scores lie between 29.9 and 73.5.
(c) Suppose that the distribution is bell-shaped. According to the empirical rule, approximately ?68%75%95%99.7% of the scores lie between 29.9 and 73.5.
(d) Suppose that the distribution is bell-shaped. According to the empirical rule, approximately 99.7% of the scores lie between and.
Draw a scatter diagram. Use store size as the independent variable. Does there appear to be a relationship between the two variables. Is it positive or negative? Determine the correlation coefficient and the coefficient of determination. Is the rel..
Find the value of x that corresponds to each of these standard scores z = -1.85.
The average labor charge for automobile mechanics is $54 per hour. The standard deviation is $4. Using Chebyshev's theorem, find the percentage of data values that will fall in the range of $48 to $60.
Question 1: In a certain city with a population of 1 million people, 5,000 people died last year. In the same city 10,000 were known to have cancer last year, of whom 500 died.
The Tiahuanaco and Huari empires both collapsed around the same time, approximately 1000 AD, leaving room for the rise of the Chimú Empire. All of this happened in which area of the world?
Find the mean, median, mode, variance, standard deviation, frequency table, cumulative frequency table, coefficient of variation, and mean deviation of the population.
A particular intersection in Delaware is equipped with a surveillance camera. The number of traffic tickets issued to drivers passing through the intersection follows the Poisson distribution and averages 4.5 per month.
Jackson County judges try thousands of cases per year. In an overwhelming majority of the cases disposed, the verdict stands as rendered. However, some cases are appealed, and of those appealed, some of the cases are reversed. Jackie Chan of The S..
As part of an ANOVA that compares three treatments, you carry out Tukey pairwise tests at the overall 5% significance level. The Tukey tests find that µ1 is significantly different from µ2 but that the other two comparisons are not significant. You..
suppose a population proportion is .40 and 80 of the time when you draw a random sample from this population you get a
I have two contingency tables. One has a chi-square value of 14.40 and the other is 27.86. Both have 6 degrees of freedom. Based on an alpha of .01 do you reject the null hypothesis?
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
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