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A National Vital Statistics Report (www.cdc.gov/nchs/) indicated that nearly 300,000 black Americans died in 2003 compared with just over 2 million white Americans. Here are histograms displaying the distributions of their ages at death.
a) Describe the overall shapes of these distributions.
b) How do the distributions differ?
c) Look carefully at the bar definitions. Where do these plots violate the rules for statistical graphs?
A power of 0.2203 can be interpreted to mean there is a 22.03% chance of selecting a sample whose sample mean is larger than 166.3 lb.
Solve different inventory control problems using an appropriate OR method.
A study of 40 bowlers showed that their average score was 186. The standard deviation of the population is 6. Construct a 95% confidence interval for the mean score of all bowlers
Was your test one-tail upper tail, lower tail, or two-tail? Explain why you chose that kind of test in this situation. Explain what your P-value means in this context.
Describe the similarities between an F-ratio and a t statistic. The basic relationship between t statistic and F-ratios can be stated in an equation. What is that equation?
a rancher runs a closed herd of breedin cattle.he keeps and breeds the top 3of bull calves based on individual
Test if the proportion of students scoring abve 600 is lower than 0.4 at the center at alpha = 0.01 using p-value.
An accounting firm has recently recruited six graduates: three men and three women. Three of the graduates are to be selected at random to work in the firms suburban office. Construct a probability tree.
Suppose a random sample of 600 credit card users is taken. What is the probability that more than 150 credit card users are very close to the total limit on their card(s)?
Write down the regression equation. State the R-squared value and the standard error and explain what they mean with respect to the data. Write down the value of the gradient of the regression line and explain what it means for this data
A national computer retailer believes that the average sales are greater for salespersons with a college degree. A random sample of 34 salespersons with a degree had an average weekly sale of $3622 last year, while 31 salespersons without a colleg..
Solve the inequality for t . Simplify your answer as much as possible.
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