Homework Answers
n=16
s = 4000
95% confidence interval
Formula
E =margin of Error
tc =2.131 ( using t-table )
95 % confidence interval is
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Question 4: An auto manufacturer investigates the average life of a model.A sample of 16 cars...
3. The mean age of sample of 100 cars from a certain manufacturer is found to...
3. The mean age of sample of 100 cars from a certain manufacturer is found to be eleven years. If the sample standard deviation of car ages is 5 years, give a 99% confidence interval for the mean age of cars from this manufacturer. 4. The sample standard deviation of the ages of a random sample of 40 television sets in a neighborhood is 3 years. Find a 95% confidence interval for the standard deviation of the entire population of...
[6-34] The manufacturer of a new fiberglass tire claims that its average life will be at...
[6-34] The manufacturer of a new fiberglass tire claims that its average life will be at least 40,000 miles. To verify this claim, sample of 15 tires are tested. Sample mean was 41.1 (in 1000 miles), and sample standard deviation was 2.50. Assuming the measurements were random sample from a Normal distribution, calculate 95% one-sided confidence interval for true mean tire life. Choose lower-bound or upper-bound, whichever is appropriate. (Round to 2 decimals.) Your Answer: Answer
A tire manufacturer would like to estimate the average tire life of its new all-season light...
A tire manufacturer would like to estimate the average tire life of its new all-season light truck tire in terms of how many miles it lasts. Determine the sample size needed to construct a 95% confidence interval with a margin of error equal to 1,500 miles. Assume the standard deviation for the tire life of this particular brand is 10,000 miles. Answer: The sample size needed is 171. Above are the questions and answers. Please provide all Excel formulas (not...
A tire manufacturer would like to estimate the average tire life of its new all-season light truck tire in terms o...
A
tire manufacturer would like to estimate the average tire life of
its new all-season light truck tire in terms of how many miles it
lasts. Determine the sample size needed to construct a 98%
confidence interval with a margin of error equal to 3,100 miles.
Assume the standard deviation for the tire life of this particular
brand is 7,000 miles.
Question Heip Atre manufacturer would ke to esimate the average tire lide of its new all-eason light thuck fre...
A manufacturer of auto engine oil claims that cars using their product can go an average...
A manufacturer of auto engine oil claims that cars using their product can go an average of 180 days without changing oil, with a standard deviation of 4 days. The distribution of the length of time between oil changes with this engine oil is known to be right-skewed. To test this claim a gas station owner takes a sample of 64 cars using this brand, and computes the sample mean. Assuming that the manufacturer’s claim is correct, which of the...
A sample of 250 auto drivers selected from New York showed that they pay on average...
A sample of 250 auto drivers selected from New York showed that they pay on average $112 auto imsirance premium per month with a standard deviation of $16. Make a 95% confidence interval for the mean monthly auto insurance premium paid by all New York auto drivers. be sure to specify the margin of error.
1. An auto company wanted to know the percentage of people who prefer to own safer...
1. An auto company wanted to know the percentage of people who prefer to own safer cars (that is, cars that possess more safety features) even if they have to pay a few thousand dollars more. A random sample of 500 people showed that 320 of them will not mind paying a few thousand dollars more to have safer cars. Construct a 90% confidence interval for the percentage of people who will not mind paying a few thousand dollars more...
QUESTION 4 (4 marks) A manufacturer of contact lens solution produce a 500ml bottle with tightly...
QUESTION 4 (4 marks) A manufacturer of contact lens solution produce a 500ml bottle with tightly controlled salinity. The Naci content of the bottles is normally distribution. A random sample of 35 bottles from the manufacturer were tested and yielded a mean of 4.6 and a standard deviation of 0.05. Construct a 95% confidence interval for the average NaCl content of the bottles of contact lens solution.
A manufacturer has obtained the following sample results for the weight of 25 widgets: Sample Average Weight:...
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Problem 5. The mileage of a certain make of car may not be exactly that rated by the manufacturer. Suppose ten cars of the same model were tested for combined city and highway mileages, with the foll...
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3. The mean age of sample of 100 cars from a certain manufacturer is found to be eleven years. If the sample standard deviation of car ages is 5 years, give a 99% confidence interval for the mean age of cars from this manufacturer. 4. The sample standard deviation of the ages of a random sample of 40 television sets in a neighborhood is 3 years. Find a 95% confidence interval for the standard deviation of the entire population of...
[6-34] The manufacturer of a new fiberglass tire claims that its average life will be at least 40,000 miles. To verify this claim, sample of 15 tires are tested. Sample mean was 41.1 (in 1000 miles), and sample standard deviation was 2.50. Assuming the measurements were random sample from a Normal distribution, calculate 95% one-sided confidence interval for true mean tire life. Choose lower-bound or upper-bound, whichever is appropriate. (Round to 2 decimals.) Your Answer: Answer
A
tire manufacturer would like to estimate the average tire life of
its new all-season light truck tire in terms of how many miles it
lasts. Determine the sample size needed to construct a 98%
confidence interval with a margin of error equal to 3,100 miles.
Assume the standard deviation for the tire life of this particular
brand is 7,000 miles.
Question Heip Atre manufacturer would ke to esimate the average tire lide of its new all-eason light thuck fre...
QUESTION 4 (4 marks) A manufacturer of contact lens solution produce a 500ml bottle with tightly controlled salinity. The Naci content of the bottles is normally distribution. A random sample of 35 bottles from the manufacturer were tested and yielded a mean of 4.6 and a standard deviation of 0.05. Construct a 95% confidence interval for the average NaCl content of the bottles of contact lens solution.
Problem 5. The mileage of a certain make of car may not be exactly that rated by the manufacturer. Suppose ten cars of the same model were tested for combined city and highway mileages, with the following results: 1 Car No. Observed Mileage 35 40 37 4232 43 38 32 41 34 (mpg) 1 23 4 56 78 9 10 a) Estimate the sample mean and standard deviation of the actual mileage of this particular make of car. Suppose that...
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