Suppose that a recent poll found that 49% of adults believe that the overall state of moral values is poor. Completeparts (a) through (c).***(a) For 250 randomly selected adults, compute the mean and standard deviation of the random variable X, the numberof adults who believe that the overall state of moral values is poor.The mean of X isThe standard deviation of X is(Round to the nearest whole number as needed.)(Round to the nearest tenth as needed.)

Given that a recent poll found that 49% of adults believe that the overall state of moralvalues is…

Answered: Suppose that a recent poll found that…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

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The SAT mathematics scores across the population of high school seniors are a normal random variable with a mean of 500 and a standard deviation of 100. Assume that the SAT mathematics test scores of different students are independent. (a) Find the probability that five randomly chosen seniors all score below 600. (b) What score must a student obtain to be in the 99th percentile?
The average fuel efficiency of U.S. light vehicles (cars, SUVs, minivans, vans, and light trucks) for 2005 was 21 miles per gallon (mpg). If the standard deviation of the population was 2.8 and the gas ratings were normally distributed, (a) what is the probability that the mean mpg for a random sample of 25 light vehicles is under 18? (b) between 20 and 24?
Suppose that a recent poll found that 41% of adults believe that the overall state of moral values is poor. Complete parts (a) through (c). (a) For 250 randomly selected adults, compute the mean and standard deviation of the random variable X, the number of adults who believe that the overall state of moral values is poor. The mean of X is 103. (Round to the nearest whole number as needed.) The standard deviation of X is 7.8. (Round to the nearest tenth as needed.) (b) Interpret the mean. Choose the correct answer below. O A. For every 103 adults, the mean is the maximum number of them that would be expected to believe that the overall state of moral values is poor. OB. For every 250 adults, the mean is the number of them that would be expected to believe that the overall state of moral values is poor. OC. For every 250 adults, the mean is the range that would be expected to believe that the overall state of moral values is poor. OD. For every 250 adults, the mean is the minimum number…
A telemarketing company knows that the daily average sales is 20. A new telemarketer who has just started with the company claims that the target of 20 sales per day is an unreasonably high target. From the 100 telemarketers working for you, you select a random sample of 16 and calculate the mean and the standard deviation of sales for a day to be 18.5 and 3.2 respectively. Is there any validity in the statement made by the new telemarketer? Test at the 5% level of significance.
A psycho-linguist has been studying the frequency of text-speech (e.g., R U Ok?, LOL ) has been progressing into EMAIL correspondence. He collects a sample of 121 EMAIL messages and computes the mean (average) number of examples of text-speech per message. He also has a huge library of archived EMAIL messages from the year 2001. From these he is able to calculate the population average and standard deviation. Compute a inferential statistic to evaluate the hypothesis that the use of text-speech has increased in the years since 2001. Use an alpha level that would insure a maximum of a %5 risk of rejecting a true null hypothesis. These are the obtained values: Population Mean from 2001: 1.6 Population Standard deviation from 2001: 1.25 Sample mean from this year: 1.98 The appropriate statistics to use is a ___ test.
Suppose that a recent poll found that 41% of adults believe that the overall state of moral values is poor. Complete parts (a) through (c). (a) For 250 randomly selected adults, compute the mean and standard deviation of the random variable X, the number of adults who believe that the overall state of moral values is poor. The mean of X is. (Round to the nearest whole number as needed.)
Suppose that a recent poll found that 65% of adults believe that the overall state of moral values is poor. Complete parts (a) through (c). (a) For 150 randomly selected adults, compute the mean and standard deviation of the random variable X, the number of adults who believe that the overall state of moral values is poor. The mean of X is (Round to the nearest whole number as needed.)
3. A local hospital doctor's team reports that the average cost of treatment of heart disease is 800 RO. To see if the average cost of treatment is different at a particular hospital, a researcher selected a random sample of 40 patients and found that the average cost of treatment is 400 RO. The standard deviation of the population is 350 RO. At test the claim of the hospital doctors.
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Are the mean number of times a month a person eats out the same for whites, blacks, Hispanics and Asians? Suppose that the table below shows the results of a study. White Black Hispanic Asian 5 4 8 9 8 1 3 3 2 5 5 5 4 2 4 1 6 6 7 Assume that all distributions are normal, the four population standard deviations are approximately the same, and the data were collected independently and randomly. Use a level of significance of 0.05. (Let 1 = White, 2 = Black, 3 = Hispanic, and 4 = Asian.) Part (a) State the null hypothesis. H0: ?1 = ?2 = ?3 = ?4 H0: At least two of the group means ?1, ?2, ?3, ?4, are not equal. Part (b) State the alternative hypothesis. Ha: At least two of the group means ?1, ?2, ?3, ?4, are not equal. Ha: ?1 = ?2 = ?3 = ?4 Part (c) Enter an exact number as an integer, fraction, or decimal. df(num) = Part (d) Enter an exact number as an integer, fraction, or decimal. df(denom) = Part (e) State the…
The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million and a standard deviation of $2 million. The salaries of professional football players are also heavily skewed right with a mean of $1.9 million and a standard deviation of $1.5 million. A random sample of 40 baseball players’ salaries and 35 football players’ salaries is selected. The mean salary is determined for both samples. Let represent the difference in the mean salaries for baseball and football players. Which of the following represents the shape of the sampling distribution for ? skewed right since the populations are both right skewed skewed right since the differences in salaries cannot be negative approximately Normal since both sample sizes are greater than 30 approximately Normal since the sum of the sample sizes is greater than 30

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