Given Below is a sample consisting of the ages of motorcyclists
37, 38, 27, 14, 28, 34, 14, 42, 33, 60
Provide the calculation of the usual interval using the mean and the standard deviation.
Let the random variable X denotes the ages of motorcyclists
The given data is 37, 38, 27, 14, 28, 34, 14, 42, 33, 60.
Standard deviation = s = 13.47
Choose level of significance = 0.05
The required confidence interval is
Here n = 10
Hence the required interval is
[23.06, 42.34].
Given Below is a sample consisting of the ages of motorcyclists 37, 38, 27, 14, 28,...
Do the Academy Awards involve discrimination based on age? Listed below are the ages of actresses and actors at the times that they won Oscars in the Best Actress and Best Actor categories. the ages are listed in order, beginning with the first Academy Awards ceremony in 1928. (Note: in 1968 there was a tie in the Best Actress category, and the mean of the two ages is used; in 1932 there was a tie in the Best Actor category,...
Inferences from Two Samples chapter Listed below are the ages of actresses the awards ceremony, but the ages in and actors at the times that they won the table below are based on the birth Oscars for the categories of Best Actress date of the winner and the date of the and Best Actor. The ages aze listed in awards certmony) chronological otder by row, so that cor- responding locations in the two tables Analyzing the Results are from the...
Section 11.7 Exercise 17-T Ques 14 38 37 34 D A store owner surveyed 25 randomly selected customers and found the ages shown (in years). The mean is 28.72 and the standard devlation is 10.20. The 7 18 22 know if the mean age of all customers is 33 vears old, Use the given information to complete parts a through f. 34 15 22 owner wants 38 28 24 16 32 31 39 38 20 35 15 40 26 42...
Sample annual salaries (in thousands of dollars) for employees at a company are listed 49 34 58 60 37 37 49 34 58 27 60 49 42 (a) Find the sample mean and sample standard deviation (b) Each employee in the sample is given a $5000 raise. Find the sample mean and sample standard deviation for the revised data set. (c) Each employee in the sample takes a pay cut of $5000 from their original salary. Find the sample mean...
A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.28 years and the standard deviation is 9.35 31 21 44 32 34 11 48 42 23 45 39 35 31 28 29 43 34 37 20 44 33 27 24 a) Construct a 80% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence interval have been met. b) How large is the margin of...
In a large hospital, a nursing director selected a random sample of 38 registered nurses and found that the mean of their ages was 31.9. The population standard deviation for the ages is 4.2. She selected a random sample of 28 nursing assistants and found the mean of their ages was 29.5. The population standard deviation of the ages for the assistants is 6.0. Find the 99% confidence interval of the differences in the ages. Use μ1 for the mean...
years. A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.84 years and the standard deviation is 8.84 25 39 43 25 42p a) Construct a 99% confidence interval for the mean age of all customers, assuming that the assumptions and conditions for the confidence 23 28 42 45 31 interval have been met. b) How large is the margin of error? c) How would the confidence interval change if you had assumed...
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A survey of 25 randomly selected customers found the ages shown? (in years). The mean is 33.16 years and the standard deviation is 9.21 years. 47 35 45 21 30 42 49 29 28 35 27 29 45 35 11 34 28 33 44 39 34 25 34 32 18 a) What is the 90% confidence interval for the mean age of all customers assuming that the assumptions and conditions for the confidence interval have been met? b) What is...
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