In a study of unemployment, the department of labor statistics wants to determine the true unemployment...
In a study of unemployment, the department of labor statistics wants to determine the true unemployment percentage within 2 percentage points. How large a sample will they need if they plan to create a 99% confidence interval but still maintain their accuracy?
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In a study of unemployment, the department of labor statistics
wants to determine the true unemployment...
The U.S. Department of Labor and Statistics wanted to compare the results of an unemployment program...
The U.S. Department of Labor and Statistics wanted to compare the results of an unemployment program for the past two months in the U.S. Suppose the proportion of the unemployed two months ago is p2 and the proportion of the unemployed one month ago is p1. A study found a 99% confidence interval for p2 - p1 to be (-0.0012, 0.003). What conclusions can we draw about the unemployment percentage for the past two months? - Since the values in...
4) EU (European Union) countries report that 40% of their labor force is female. The United Nations wants to determine if the percentage of females in the U.S. labor force is the same. Represent...
4) EU (European Union) countries report that 40% of their labor force is female. The United Nations wants to determine if the percentage of females in the U.S. labor force is the same. Representatives from the United States Department of Labor plan to check a random sample of over 10,000 employment records on file to estimate the percentage of females in the U.S. labor force. a The Department of Labor wants to estimate the percentage of females in the US,...
(5 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(5 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 38 cars traveling on a particular stretch of highway revealed an average speed of 68.9 miles per hour with a standard deviation of 5.9 miles per hour. Round to 4 decimal places. 1.Calculate a 99% confidence interval for the true mean speed of all cars on this particular stretch of highway. ( , ) 2. Based on the confidence interval do you think...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 49 cars traveling on a particular stretch of highway revealed an average speed of 68.7 miles per hour with a standard deviation of 9.8 miles per hour. Round to 4 decimal places. 1.Calculate a 99% confidence interval for the true mean speed of all cars on this particular stretch of highway. ( , ) 2. What sample size is needed to estimate the...
5/17/19 9:34 PM a. The Department of Labor wants to estimate the percentage of females in the US labor force to within t5%, with 90% confidence. How many employment records should be sampled? o....
5/17/19 9:34 PM a. The Department of Labor wants to estimate the percentage of females in the US labor force to within t5%, with 90% confidence. How many employment records should be sampled? o. They actually select a random sample of 525 employment records, and find that 225 of the people are females. Construct the 90% confidence interval. c. Interpret the confidence interval in this context. d. Explain what 90% confidence means in this context. e. Should representatives from the...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the
driving habits of individuals. A sample of 28 cars traveling on a
particular stretch of highway revealed an average speed of 69.9
miles per hour with a standard deviation of 4.2 miles per hour.
Round to 4 decimal places.
1.Calculate a 95% confidence interval for the true mean speed of
all cars on this particular stretch of highway.
( , )
2. What sample size is needed to estimate the...
A researcher wants to determine what percentage of the population skips breakfast. A study was done...
A researcher wants to determine what percentage of the population skips breakfast. A study was done several years ago that found 39% of people do not eat breakfast. How large of a sample would the researcher need if he wants to be at a 95% confidence level as well as a margin of error of 2%?
A company with a large fleet of cars wants to study the gasoline usage. They check...
A company with a large fleet of cars wants to study the gasoline usage. They check the gasoline usage for 50 company trips chosen at random, finding a mean of 25.02 mpg. Based on the past experience, they believe the standard deviation of the general gasoline usage is 4.83 mpg. Which kind of confidence intervals is appropriate to use here, z-interval or t-interval? Please use R to find the critical value they need when constructing a 95% CI. Please. Use...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 43 cars traveling on a particular stretch of highway revealed an average speed of 67.7 miles per hour with a standard deviation of 7.2 miles per hour. Round to 4 decimal places. 1.Calculate a 90% confidence interval for the true mean speed of all cars on this particular stretch of highway. 2. What sample size is needed to estimate the true average speed...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 30 cars traveling on a particular stretch of highway revealed an average speed of 66.1 miles per hour with a standard deviation of 8.5 miles per hour. Round to 4 decimal places. 1.Calculate a 95% confidence interval for the true mean speed of all cars on this particular stretch of highway. 2. What sample size is needed to estimate the true average speed...
4) EU (European Union) countries report that 40% of their labor force is female. The United Nations wants to determine if the percentage of females in the U.S. labor force is the same. Representatives from the United States Department of Labor plan to check a random sample of over 10,000 employment records on file to estimate the percentage of females in the U.S. labor force. a The Department of Labor wants to estimate the percentage of females in the US,...
5/17/19 9:34 PM a. The Department of Labor wants to estimate the percentage of females in the US labor force to within t5%, with 90% confidence. How many employment records should be sampled? o. They actually select a random sample of 525 employment records, and find that 225 of the people are females. Construct the 90% confidence interval. c. Interpret the confidence interval in this context. d. Explain what 90% confidence means in this context. e. Should representatives from the...
(3 points) The Highway Safety Department wants to study the
driving habits of individuals. A sample of 28 cars traveling on a
particular stretch of highway revealed an average speed of 69.9
miles per hour with a standard deviation of 4.2 miles per hour.
Round to 4 decimal places.
1.Calculate a 95% confidence interval for the true mean speed of
all cars on this particular stretch of highway.
( , )
2. What sample size is needed to estimate the...
A company with a large fleet of cars wants to study the gasoline usage. They check the gasoline usage for 50 company trips chosen at random, finding a mean of 25.02 mpg. Based on the past experience, they believe the standard deviation of the general gasoline usage is 4.83 mpg. Which kind of confidence intervals is appropriate to use here, z-interval or t-interval? Please use R to find the critical value they need when constructing a 95% CI. Please. Use...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 43 cars traveling on a particular stretch of highway revealed an average speed of 67.7 miles per hour with a standard deviation of 7.2 miles per hour. Round to 4 decimal places. 1.Calculate a 90% confidence interval for the true mean speed of all cars on this particular stretch of highway. 2. What sample size is needed to estimate the true average speed...
(3 points) The Highway Safety Department wants to study the driving habits of individuals. A sample of 30 cars traveling on a particular stretch of highway revealed an average speed of 66.1 miles per hour with a standard deviation of 8.5 miles per hour. Round to 4 decimal places. 1.Calculate a 95% confidence interval for the true mean speed of all cars on this particular stretch of highway. 2. What sample size is needed to estimate the true average speed...
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