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1 A+ L At a hazelnut spread factory in Chelsea, 12 jars are randomly selected and...
5.6.8. It is known that some brands of peanut butter contain impurities within an acceptable level....
5.6.8. It is known that some brands of peanut butter contain impurities within an acceptable level. A test conducted on randomly selected 12 jars of a certain brand of peanut butter resulted in the following percentages of impurities: 1.9 2.7 2. 2.8 2.3 3.6 1.4 1.8 2.1 3.2 2.0 Construct a 95% confidence interval for the average percentage of impurities in this brand of peanut butter Give an approximate 95% confidence interval for the population variance. Interpret your results and...
1. In a study designed to test the effectiveness of acupuncture for treating migraine, 142 subjects...
1. In a study designed to test the effectiveness of acupuncture for treating migraine, 142 subjects were treated with acupuncture. The numbers of migraine attacks for the treatment group had a mean of 1.8 and a standard deviation of 1.4. Construct a 95% confidence interval estimate of (I potnt) number of migraine attacks for all people treated with acupuncture. 0 1.7 <u<1.9 O 1.5 <A<2.1 1.3 < μ <2.3 2. A sample size of n 20 is a simple random...
The grade point averages (GPA) for 12 randomly selected college students are shown on the right....
The grade point averages (GPA) for 12 randomly selected college
students are shown on the right. Complete parts (a) through (c)
below. Assume the population is normally distributed.
2.1, 3.1, 2.6, 1.5, 0.6, 4.0, 2.1, 1.1, 3.6, 0.5, 2.1, 3.4
construct a 90% confidence interval for the population mean
The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) 2.1 below. 1.5 Assume the population is normally distributed. 2.1...
A radio station wants to control the time allotted to unpaid public service commercials. If there...
A radio station wants to control the time allotted to unpaid public service commercials. If there are too many such commercials, the station loses revenue; if there are too few, the station loses points with the Federal Communications Commission. The target figure is 2.2 commercial minutes per hour. Data on the minutes spent by the radio station on unpaid public service commercials are reported in the following table for a randonm sample of 30 hours. 1.8 2.2 1.5 2.5 2.1...
A sample of 45 people were randomly selected from among the workers in a shoe factory....
A sample of 45 people were randomly selected from among the workers in a shoe factory. The time taken for each person to polish a finished shoe was measured. The sample mean was 2.3 minutes. Assume that o=0.23 minutes. Construct a 90% confidence interval for the true mean time, u, to polish a shoe. 02.24 to 2.36 minutes 2.21 to 2.39 minutes 2.22 to 2.38 minutes 0 2.23 to 2.37 minutes 0 2.29 to 2.31 minutes O None of the...
The grade point averages (GPA) for 12 randomly selected college students are shown on the right....
The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below 2.5 34 2.6 1.9 0.5 4.0 2.2 1.2 3.8 0.2 2.3 3.1 Assume the population is normally distributed. (a) Find the sample mean. x(Round to two decimal places as needed) (b) Find the sample standard deviation. s(Round to two decimal places as needed.) (c) Construct a 95% confidence interval for the population mean A 95% confidence interval for...
Refer to the data set of 20 randomly selected presidents given below. Treat the data as...
Refer to the data set of 20 randomly selected presidents given below. Treat the data as a sample and find the proportion of presidents who were taller than their opponents. Use that result to construct a 95% confidence interval estimate of the population percentage. Based on the result, does it appear that greater height is an advantage for presidential candidates? Why or why not? Click the icon to view the table of heights. Construct a 95% confidence interval estimate of...
Have you ever wondered what it means to click the “offset carbon emissions” button when you book ...
Have you ever wondered what it means to click the “offset carbon emissions” button when you book a flight or train trip? It adds a small cost to your ticket, but how does this reduce emissions? The money is typically used to fund projects that reduce carbon emissions. One such project type is the introduction of more efficient cooking stoves into communities. Much of the world uses inefficient charcoal or wood stoves that result in excessive indoor air pollution, deforestation,...
1. Use the given degree of confidence and sample data to construct a confidence interval for...
1. Use the given degree of confidence and sample data to construct a confidence interval for the point) population proportion p. A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the true proportion of all voters in the state who favor approval. 0 0.438<p0.505 0 0.444 p0.500 0 0.435<p<0.508 O 0.471 p0.472 2. Use the given data to find the minimum sample size required...
HOMEWORK 6 20 points Chapter 7. Confidence Intervals. Submit all work done by hand or using Excel...
needing help with statistics homework
HOMEWORK 6 20 points Chapter 7. Confidence Intervals. Submit all work done by hand or using Excel to recelve ful credit. 1. (a) What is a confidence interval? (b) What do confidence intervals allow researchers to conclude? Explain your answers 2 What factors affect the size of a confidence interval? Explain your answer. 3. (a) What does the p-value indicate? Explain. (b) What are the typical values of the p- value? (c) What effect will...
5.6.8. It is known that some brands of peanut butter contain impurities within an acceptable level. A test conducted on randomly selected 12 jars of a certain brand of peanut butter resulted in the following percentages of impurities: 1.9 2.7 2. 2.8 2.3 3.6 1.4 1.8 2.1 3.2 2.0 Construct a 95% confidence interval for the average percentage of impurities in this brand of peanut butter Give an approximate 95% confidence interval for the population variance. Interpret your results and...
1. In a study designed to test the effectiveness of acupuncture for treating migraine, 142 subjects were treated with acupuncture. The numbers of migraine attacks for the treatment group had a mean of 1.8 and a standard deviation of 1.4. Construct a 95% confidence interval estimate of (I potnt) number of migraine attacks for all people treated with acupuncture. 0 1.7 <u<1.9 O 1.5 <A<2.1 1.3 < μ <2.3 2. A sample size of n 20 is a simple random...
The grade point averages (GPA) for 12 randomly selected college
students are shown on the right. Complete parts (a) through (c)
below. Assume the population is normally distributed.
2.1, 3.1, 2.6, 1.5, 0.6, 4.0, 2.1, 1.1, 3.6, 0.5, 2.1, 3.4
construct a 90% confidence interval for the population mean
The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) 2.1 below. 1.5 Assume the population is normally distributed. 2.1...
A radio station wants to control the time allotted to unpaid public service commercials. If there are too many such commercials, the station loses revenue; if there are too few, the station loses points with the Federal Communications Commission. The target figure is 2.2 commercial minutes per hour. Data on the minutes spent by the radio station on unpaid public service commercials are reported in the following table for a randonm sample of 30 hours. 1.8 2.2 1.5 2.5 2.1...
A sample of 45 people were randomly selected from among the workers in a shoe factory. The time taken for each person to polish a finished shoe was measured. The sample mean was 2.3 minutes. Assume that o=0.23 minutes. Construct a 90% confidence interval for the true mean time, u, to polish a shoe. 02.24 to 2.36 minutes 2.21 to 2.39 minutes 2.22 to 2.38 minutes 0 2.23 to 2.37 minutes 0 2.29 to 2.31 minutes O None of the...
The grade point averages (GPA) for 12 randomly selected college students are shown on the right. Complete parts (a) through (c) below 2.5 34 2.6 1.9 0.5 4.0 2.2 1.2 3.8 0.2 2.3 3.1 Assume the population is normally distributed. (a) Find the sample mean. x(Round to two decimal places as needed) (b) Find the sample standard deviation. s(Round to two decimal places as needed.) (c) Construct a 95% confidence interval for the population mean A 95% confidence interval for...
Refer to the data set of 20 randomly selected presidents given below. Treat the data as a sample and find the proportion of presidents who were taller than their opponents. Use that result to construct a 95% confidence interval estimate of the population percentage. Based on the result, does it appear that greater height is an advantage for presidential candidates? Why or why not? Click the icon to view the table of heights. Construct a 95% confidence interval estimate of...
1. Use the given degree of confidence and sample data to construct a confidence interval for the point) population proportion p. A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the true proportion of all voters in the state who favor approval. 0 0.438<p0.505 0 0.444 p0.500 0 0.435<p<0.508 O 0.471 p0.472 2. Use the given data to find the minimum sample size required...
needing help with statistics homework
HOMEWORK 6 20 points Chapter 7. Confidence Intervals. Submit all work done by hand or using Excel to recelve ful credit. 1. (a) What is a confidence interval? (b) What do confidence intervals allow researchers to conclude? Explain your answers 2 What factors affect the size of a confidence interval? Explain your answer. 3. (a) What does the p-value indicate? Explain. (b) What are the typical values of the p- value? (c) What effect will...
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