6. An insurance company claims that the average automobile on the road today is less than...
6. An insurance company claims that the average automobile on the road today is less than 4 years old. A random sample of 15 cars had an average age of 5.4 years with a standard deviation of 1.1 years. Assume that the population is normally distributed. Test the claim at ∝= 0.05
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6. An insurance company claims that the average automobile on
the road today is less than...
An insurance company claims the average car on the road is less than 6 years old....
An insurance company claims the average car on the road is less than 6 years old. Based on a random sample of 15 cars, the mean age is 5.8 years with a standard deviation of 1.1 years. Does the sample support the insurance company’s claim?
DMV claims that their average wait times are less than 15 minutes. A random sample of...
DMV claims that their average wait times are less than 15 minutes. A random sample of 10 people had a mean wait time of 13 minutes with a standard deviation of 3.5 minutes. Assuming wait times are normally distributed , test the claim at alpha=0.10 . Hint : One Mean, T-test.
90) The Department of Transportation would like to test the hypothesis that the average age of...
90) The Department of Transportation would like to test the hypothesis that the average age of cars on the road is less than 12 years. A random sample of 45 cars had an average age of 10.6 years. It is believed that the population standard deviation for the age of cars is 4.1 years. The Department of Transportation would like to set a = 0.05.
A company claims that their lightbulbs last an average of 400 days. To test this claim,...
A company claims that their lightbulbs last an average of 400 days. To test this claim, a random sample of 25 lightbulbs is tested and it is observed that they last for an average of 380 days with a standard deviation of 60 days. Part A) Assuming that the population of the time to failure of all lightbulbs is normally distributed, test the null hypothesis that the average life-length of their lightbulb is 400 days against the alternative that it...
An automobile insurer has found that repair claims are Normally distributed with a mean of $890...
An automobile insurer has found that repair claims are Normally distributed with a mean of $890 and a standard deviation of $850. (a) Find the probability that a single claim, chosen at random, will be less than $840. ANSWER: (b) Now suppose that the next 100 claims can be regarded as a random sample from the long-run claims process. Find the probability that the average x¯ of the 100 claims is smaller than $840. ANSWER: (c) If a sample larger...
An automobile insurer has found that repair claims are Normally distributed with a mean of $580...
An automobile insurer has found that repair claims are Normally distributed with a mean of $580 and a standard deviation of $530. (a) Find the probability that a single claim, chosen at random, will be less than $560. ANSWER: (b) Now suppose that the next 100 claims can be regarded as a random sample from the long-run claims process. Find the probability that the average x¯ of the 100 claims is smaller than $560. ANSWER: (c) If a sample larger...
Please answer this. Thank you 1. A company manufactures gas bottles for industrial use and claims...
Please answer this. Thank you
1. A company manufactures gas bottles for industrial use and claims that the average hours of use is 500 hours. A purchaser of these bottles doubts the claims and believes the use time is less than 500 hours. To test the manufacturers, claim the purchasing agent randomly selects six of these gas bottles from the manufacturer and finds that the sample average is 493 hours with a sample standard deviation of4 hours Assuming that the...
A survey claims that the average cost of a hotel room in Tulsa, Oklahoma, is less...
A survey claims that the average cost of a hotel room in Tulsa, Oklahoma, is less than $49.21. In order to test this claim, a researcher selects a sample of 26 hotel rooms and finds the average cost equal to $47.37 with a sample standard deviation of $6.42. Assume the population random variable is normal. At alpha=.1.
A. A supermarket claims that the average wait time at the checkout counter is less than...
A. A supermarket claims that the average wait time at the checkout counter is less than 9 minutes. We can assume that the population is Normally distributed. Consider H0: mu >= 9 H1: mu < 9 A random sample of 50 customers yielded an average wait time of 8.2 minutes and a standard deviation of 2.5 minutes. What is the value of the test statistic (tstat or t-sub-xbar)? (Provide two decimal places)____________ B. Let Z be a standard Normal random...
- Statistics - A report in USA Today claims that the average age of commercial jets...
- Statistics - A report in USA Today claims that the average age of commercial jets in the US is 14 years. An executive of a large airline selects a sample of n=35 planes and finds that the average age of the planes is 18 years with a standard deviation of 2.7 years. Is there evidence to suggest that the average age of this airline’s planes is less than the national average? Conduct the test using a 5% level of...
90) The Department of Transportation would like to test the hypothesis that the average age of cars on the road is less than 12 years. A random sample of 45 cars had an average age of 10.6 years. It is believed that the population standard deviation for the age of cars is 4.1 years. The Department of Transportation would like to set a = 0.05.
Please answer this. Thank you
1. A company manufactures gas bottles for industrial use and claims that the average hours of use is 500 hours. A purchaser of these bottles doubts the claims and believes the use time is less than 500 hours. To test the manufacturers, claim the purchasing agent randomly selects six of these gas bottles from the manufacturer and finds that the sample average is 493 hours with a sample standard deviation of4 hours Assuming that the...
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