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The birth weights for twins are normally distributed with a mean of 2353 grams and a standard deviation of 647 grams. Use z-scores to determine which birth weight could be considered unusual.
Let X be a discrete random variable with possible values x = -1,0,1,2 and probability function f(x) = kx3 + 0.15 for x = -1,0,1,2.
A researcher investigated the effect of volume of background noise on participants' accuracy rates while performing a difficult task. He tested three groups of randomly selected students and obtaine
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall.
Determine the error for each of the following forecasts. Compute MAD and MSE. Period Value Forecast Error 1 202 - - 2 191 202 3 173 192 4 169 181 5 171 174 6 175 172 7 182 174 8 196 179 9 204 189 10
You toss a coin five times. Each time it lands on heads, you double your money. Each time it lands on tails you lose half of your money. You start with two dollars. What is the expected amount that
What percentage of these students drink coffee or smoke cigarettes? What percentage of these students drink coffee but smoke cigarettes? What percentage of these students neither drink coffee nor smok
The federal government decides to screen the entire population for the disease and then administer the treatment. Will people be more likely or less likely to get bright green skin if such a policy
Of all college degrees in the United States, 50% are bachelor's degrees, 59% are degrees earned by women and 29% are bachelor's degrees earned by women. What percent of all degrees are earned by men
Regardless of your answer in part a, carry out an appropriate nonparametric test to determine whether the mean thickness is greater than 41.Use = .05.
An experiment was designed to estimate the mean difference in weight gain for pigs fed ration A as compared with those fed ration B. Eight pairs of pigs were used. The pigs within each pair were litte
Suppose the chamber conducted a pilot study of 200 adults between the ages of 25 and 35 that indicated 28 with the desired attribute. How large a sample would be needed for the survey to estimate th
Assume you plan to construct a 95% confidence interval. The numbers of online applications from simple random samples of college applications for 2003 and for the current year are given below. Find
If the population mean speed on this stretch of the highway has been 68mph with a standard deviation of 5mph, what is the sample size needed to detect an increase in speed on this stretch of the hi
Define Population 1 as import cars and Population 2 as domestic cars. Construct a 90% (0.10) confidence interval for the difference in population mean and interpret the results.
The thickness of eight pads designed for use in aircraft engine mounts are measured. The measurements are 41.83, 42.68, 41.01, 41.37, 41.83, 40.50, 41.70, and 41.42. Assume the thicknesses are a sam
Define Population 1 as male drivers and Population 2 as female drivers and use the critical value approach to test this hypothesis with alpha = 0.05.
The financial analysts at Duro headquarters believe the purchase can be justified if the equipment will lead to an average increase in production of at least 10,000 bricks per day. She intends to us
It is believed that the population standard deviation for credit scores is 44 and 41 for Dallas and Houston residents, respectively. Discover Card would like to set α = 0.05. Define Po
A national manufacturer of unattached garages discovered that the distribution of the lengths of time it takes two construction workers to erect the Red Barn model is normally distributed with a mea
What is the percentage of the total area under the normal curve within plus and minus 1.6 standard deviations of the mean?
If the population mean speed on this stretch of the highway has been 68mph with a standard deviation of 5mph, what is the sample size needed to detect an increase in speed on this stretch of the hig
The effectiveness of treating respiratory infections with herbal remedies was studied. "Days of fever" was used to measure effects. Among 413 children treated with herbal remedies, the mean number o
Use a significance level of 0.01 to test the claim that p1 = p2. Use the given sample sizes and numbers of success to find