Homework Answers
Note, if sigma is known then we use Z-Test.
and
If sigma is unknown then we use t -test.
Also, Here claim is that, population mean is equal (not equal) to the sample mean.
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Question 5 of 6 (1 point) View problem in a pop-up 8.2 Section Exercise 22 Ten...
1. state the hypothesis and identify the claim with the correct hypothesis. Also one or two...
1. state the hypothesis and identify the claim with the correct
hypothesis. Also one or two tailed test?
2. Compute the test value
3. Find the P-value
4. Make the decision to reject or not reject the null
hypothesis
5. Summarize the results
Ten years ago, the average acreage of farms in a certain geographic region was 65 acres. The standard deviation of the population was 7 acres. A recent study consisting of 28 farms showed that the average was...
Question 3 of 6 (1 point) View problem in a pop-up 8.2 Section Exercise 8 The...
Question 3 of 6 (1 point) View problem in a pop-up 8.2 Section Exercise 8 The mean salary of federal government employees on the General Schedule is $59,593. The average salary of 33 state employees who do similar work is $58,930 witho = $1500. At the 0.10 level of significance, can it be concluded that state employees earn on average less than federal employees? Source: New York Times Almanac. Part 1 State the hypotheses and identify the claim with the...
Question 2 of 3 (1 point) View problem in a pop-up 11.1 Section Exercise 8 (calc)...
Question 2 of 3 (1 point) View problem in a pop-up 11.1 Section Exercise 8 (calc) Action % of time 70.8 8.2 9.0 12.0 On time National Aviation System delay Aircraft arriving late Other (because of weather and other conditions) Download data Source: www.transtats.bts.gov Records of 200 flights for a major airline company showed that 128 planes were on time; 32 were delayed because of weather, 16 because of a National Aviation System delay, and the rest because of arriving...
Next Previous 3 4 5 6 Question 2 of 6 (1 point) View problem in a pop-up According to the National Association of Home Builders, the average cost of building a home in the Northeast is $117.91...
Next Previous 3 4 5 6 Question 2 of 6 (1 point) View problem in a pop-up According to the National Association of Home Builders, the average cost of building a home in the Northeast is $117.91 per square foot. A random sample of 37 new homes indicated that the mean cost was $121.14 and the standard deviation was $20. Can it be concluded that the mean Fo cost differs from $117.91, using the 0.10 level of significance? Use thP...
Question 4 of 5 (1 point) View problem in a pop-up 9.2 Section Exercise 12a,b c,d...
Question 4 of 5 (1 point) View problem in a pop-up 9.2 Section Exercise 12a,b c,d (p-value, calc) PGA 1147 1344 9188 5687 10,508 4910 8553 7573 375 LPGA 48 76 863 100 1876 A 2029 4364 Download data for the mean earnings of PGA golfers. Assume the variables are normally distributed and the variances are unequal. Use Step 1: a. State the hypotheses and identify the claim with the correct hypothesis. between the means The null hypothesis H is...
Question 2 of 10 (1 point) View problem in a pop-up The average "moviegoer" sees 8.5...
Question 2 of 10 (1 point) View problem in a pop-up The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who sees at least one movie in a theater in a 12-month period. A random sample of 46 moviegoers from a large university revealed that the average number of movies seen per person was 10.1. The population standard deviation is 3.2 movies. At the 0.05 level of significance, can it be concluded that this...
Question 7 of 7 (12 points) View problem in a pop-up Bullying is a problem at...
Question 7 of 7 (12 points) View problem in a pop-up Bullying is a problem at any age but especially for students aged 12 to 18. A study showed that 7.2% of all students in this age bracket reported being bullied at school during the past six months with 6th grade having the highest incidence at 13.9% and 12th grade the lowest at 2.2%. To see if there is a difference between public and private schools, 170 students were randomly...
Question 2 of 5 (1 point) View problem in a pop-UR 8.2 Section Exercise 17-20 (table...
Question 2 of 5 (1 point) View problem in a pop-UR 8.2 Section Exercise 17-20 (table A sample of size 52 has sample mean x = 53.4 and sample deviations -- 9.4. Part 1 Construct a 90% confidence interval for the population mean w. Round the answers to one decimal place. A 90% confidence interval for the population mean 4 is S.A. <<55.6 Part 2 out of 2 If the sample size were * = 48. would the confidence interval...
Previous Next Question 3 of 3 (1 point) View problem in a pop-up 11.1 Section Exercise...
Previous Next Question 3 of 3 (1 point) View problem in a pop-up 11.1 Section Exercise 12 (calc) The Head Start Program provides a wide range of services to low-income children up to the age of 5 and their families. Its goals are to provide services to improve social and learning skills and to improve health and nutrition status so that the participants can begin school on an equal footing with their more advantaged peers. The distribution of ages for...
Question 5 of 32 (1 point) View problem in a pop-up 10.2 Section Exercise 14a,b. Number...
Question 5 of 32 (1 point) View problem in a pop-up 10.2 Section Exercise 14a,b. Number of fires x 47 84 62 57 72 69 58 Number of acres burned y 44 81 59 54 69 66 55 Source: National Interagency Fire Center. Download Data Part 1 The correlation coefficient for the data is r = 1 and a = 0.05. Should regression analysis be done? The regression analysis should be done. Part 2 out of 3 Find the equation...
1. state the hypothesis and identify the claim with the correct
hypothesis. Also one or two tailed test?
2. Compute the test value
3. Find the P-value
4. Make the decision to reject or not reject the null
hypothesis
5. Summarize the results
Ten years ago, the average acreage of farms in a certain geographic region was 65 acres. The standard deviation of the population was 7 acres. A recent study consisting of 28 farms showed that the average was...
Question 3 of 6 (1 point) View problem in a pop-up 8.2 Section Exercise 8 The mean salary of federal government employees on the General Schedule is $59,593. The average salary of 33 state employees who do similar work is $58,930 witho = $1500. At the 0.10 level of significance, can it be concluded that state employees earn on average less than federal employees? Source: New York Times Almanac. Part 1 State the hypotheses and identify the claim with the...
Question 2 of 3 (1 point) View problem in a pop-up 11.1 Section Exercise 8 (calc) Action % of time 70.8 8.2 9.0 12.0 On time National Aviation System delay Aircraft arriving late Other (because of weather and other conditions) Download data Source: www.transtats.bts.gov Records of 200 flights for a major airline company showed that 128 planes were on time; 32 were delayed because of weather, 16 because of a National Aviation System delay, and the rest because of arriving...
Next Previous 3 4 5 6 Question 2 of 6 (1 point) View problem in a pop-up According to the National Association of Home Builders, the average cost of building a home in the Northeast is $117.91 per square foot. A random sample of 37 new homes indicated that the mean cost was $121.14 and the standard deviation was $20. Can it be concluded that the mean Fo cost differs from $117.91, using the 0.10 level of significance? Use thP...
Question 4 of 5 (1 point) View problem in a pop-up 9.2 Section Exercise 12a,b c,d (p-value, calc) PGA 1147 1344 9188 5687 10,508 4910 8553 7573 375 LPGA 48 76 863 100 1876 A 2029 4364 Download data for the mean earnings of PGA golfers. Assume the variables are normally distributed and the variances are unequal. Use Step 1: a. State the hypotheses and identify the claim with the correct hypothesis. between the means The null hypothesis H is...
Question 2 of 10 (1 point) View problem in a pop-up The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who sees at least one movie in a theater in a 12-month period. A random sample of 46 moviegoers from a large university revealed that the average number of movies seen per person was 10.1. The population standard deviation is 3.2 movies. At the 0.05 level of significance, can it be concluded that this...
Question 7 of 7 (12 points) View problem in a pop-up Bullying is a problem at any age but especially for students aged 12 to 18. A study showed that 7.2% of all students in this age bracket reported being bullied at school during the past six months with 6th grade having the highest incidence at 13.9% and 12th grade the lowest at 2.2%. To see if there is a difference between public and private schools, 170 students were randomly...
Question 2 of 5 (1 point) View problem in a pop-UR 8.2 Section Exercise 17-20 (table A sample of size 52 has sample mean x = 53.4 and sample deviations -- 9.4. Part 1 Construct a 90% confidence interval for the population mean w. Round the answers to one decimal place. A 90% confidence interval for the population mean 4 is S.A. <<55.6 Part 2 out of 2 If the sample size were * = 48. would the confidence interval...
Previous Next Question 3 of 3 (1 point) View problem in a pop-up 11.1 Section Exercise 12 (calc) The Head Start Program provides a wide range of services to low-income children up to the age of 5 and their families. Its goals are to provide services to improve social and learning skills and to improve health and nutrition status so that the participants can begin school on an equal footing with their more advantaged peers. The distribution of ages for...
Question 5 of 32 (1 point) View problem in a pop-up 10.2 Section Exercise 14a,b. Number of fires x 47 84 62 57 72 69 58 Number of acres burned y 44 81 59 54 69 66 55 Source: National Interagency Fire Center. Download Data Part 1 The correlation coefficient for the data is r = 1 and a = 0.05. Should regression analysis be done? The regression analysis should be done. Part 2 out of 3 Find the equation...
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