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The records of a casualty insurance company show that, in the past, its clients have had...
The records of a casualty insurance company show that, in the past, its clients have had...
The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.9 auto accidents per day with a variance of 0.0025. The actuaries of the company claim that the variance of the number of accidents per day is no longer equal to 0.0025. Suppose that we want to carry out a hypothesis test to see if there is support for the actuaries' claim. State the null hypothesis H, and the alternative hypothesis...
The records of a casualty insurance company show that in the past, its dients have had...
The records of a casualty insurance company show that in the past, its dients have had a mean of 1.7 auto accidents per day with a standard deviation of 0.04. The actuaries of the company claim that the standard deviation of the number of accidents per day is no longer equal to 0.04. Suppose that we want to carry out a hypothesis test to see if there is support for the actuaries' claim. State the null hypothesis H, and the...
Records from previous years for a casualty insurance company show that its clients average a combined...
Records from previous years for a casualty insurance company show that its clients average a combined total of 1.7 auto accidents per day, with a standard deviation of 0.56. The actuaries of the company claim that the current standard deviation, o, of the number of accidents per day is not equal to 0.56. A random sample of 10 recent days had a mean of 2 accidents per day with a standard deviation of 0.26. If we assume that the number...
Records show that the lifetimes of batteries manufactured by a certain company have a mean of...
Records show that the lifetimes of batteries manufactured by a certain company have a mean of 620 hours and a standard deviation of 136. The company advertises that, currently, the standard deviation is less than 136, following some adjustments in production practices. A random sample of 23 recently produced batteries from this company had a mean lifetime of 618 hours and a standard deviation of 96. Is there enough evidence to conclude, at the 0.05 level of significance, that the...
Records show that the lifetimes of batteries manufactured by a certain company have a mean of...
Records show that the lifetimes of batteries manufactured by a certain company have a mean of 620 hours and a standard deviation of 136. The company advertises that, currently, the standard deviation is less than 136, following some adjustments in production practices. A random sample of 23 recently produced batteries from this company had a mean lifetime of 618 hours and a standard deviation of 96. Is there enough evidence to conclude, at the 0.05 level of significance, that the...
Past records suggest that the mean annual income, Hy, of teachers in state of California is...
Past records suggest that the mean annual income, Hy, of teachers in state of California is less than or equal to the mean annual income, My, of teachers in Oregon. In a current study, a random sample of 10 teachers from California and an independent random sample of 10 teachers from Oregon have been asked to report their mean annual income. The data obtained are as follows: Annual income in dollars California 43096, 44370, 53093, 52462, 41185,49592,41491, 45798,43632, 48322 Oregon...
4. Insurance companies charge clients under 25 more for auto insurance than clients over 25. They...
4. Insurance companies charge clients under 25 more for auto insurance than clients over 25. They claim this is because clients under 25 have more accidents. A random sample of 40 drivers under 25 had a mean of 1.2 accidents per year with a standard deviation of .1. A sample of 40 drivers over 25 had a mean of .94 accidents per year with a standard deviation of .2. From this data can we conclude the Insurance companies are correct...
The breaking strengths of cables produced by a certain manufacturer have a mean, p, of 1750...
The breaking strengths of cables produced by a certain manufacturer have a mean, p, of 1750 pounds, and a standard deviation of 100 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 150 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1760 pounds. Can we support, at the 0.05 level of significance, the claim that the mean breaking strength...
The records show that the lifetimes of electric bulbs manufactured in the past by BIG Corporation...
The records show that the lifetimes of electric bulbs manufactured in the past by BIG Corporation have a mean of 8840 hours and a variance of 15783. The corporation claims that the current variance, c?, is less than 15783 following some adjustments in its production unit. A random sample of 31 bulbs from the current production lot has a mean lifetime of 8842 hours, with a variance of 11977. Assume that the lifetimes of recently manufactured bulbs are approximately normally...
Past records suggest that the mean annual income, 12, of teachers in state of Georgia is...
Past records suggest that the mean annual income, 12, of teachers in state of Georgia is greater than or equal to the mean annual income, H2, of teachers in Indiana. In a current study, a random sample of 15 teachers from Georgia and an independent random sample of 15 teachers from Indiana have been asked to report their mean annual income. The data obtained are as follows. Annual income in dollars Georgia 35563, 41690, 51807, 41824, 35509, 35642, 31758, 46318,...
The records of a casualty insurance company show that, in the past, its clients have had a mean of 1.9 auto accidents per day with a variance of 0.0025. The actuaries of the company claim that the variance of the number of accidents per day is no longer equal to 0.0025. Suppose that we want to carry out a hypothesis test to see if there is support for the actuaries' claim. State the null hypothesis H, and the alternative hypothesis...
The records of a casualty insurance company show that in the past, its dients have had a mean of 1.7 auto accidents per day with a standard deviation of 0.04. The actuaries of the company claim that the standard deviation of the number of accidents per day is no longer equal to 0.04. Suppose that we want to carry out a hypothesis test to see if there is support for the actuaries' claim. State the null hypothesis H, and the...
Records from previous years for a casualty insurance company show that its clients average a combined total of 1.7 auto accidents per day, with a standard deviation of 0.56. The actuaries of the company claim that the current standard deviation, o, of the number of accidents per day is not equal to 0.56. A random sample of 10 recent days had a mean of 2 accidents per day with a standard deviation of 0.26. If we assume that the number...
Records show that the lifetimes of batteries manufactured by a certain company have a mean of 620 hours and a standard deviation of 136. The company advertises that, currently, the standard deviation is less than 136, following some adjustments in production practices. A random sample of 23 recently produced batteries from this company had a mean lifetime of 618 hours and a standard deviation of 96. Is there enough evidence to conclude, at the 0.05 level of significance, that the...
Records show that the lifetimes of batteries manufactured by a certain company have a mean of 620 hours and a standard deviation of 136. The company advertises that, currently, the standard deviation is less than 136, following some adjustments in production practices. A random sample of 23 recently produced batteries from this company had a mean lifetime of 618 hours and a standard deviation of 96. Is there enough evidence to conclude, at the 0.05 level of significance, that the...
Past records suggest that the mean annual income, Hy, of teachers in state of California is less than or equal to the mean annual income, My, of teachers in Oregon. In a current study, a random sample of 10 teachers from California and an independent random sample of 10 teachers from Oregon have been asked to report their mean annual income. The data obtained are as follows: Annual income in dollars California 43096, 44370, 53093, 52462, 41185,49592,41491, 45798,43632, 48322 Oregon...
4. Insurance companies charge clients under 25 more for auto insurance than clients over 25. They claim this is because clients under 25 have more accidents. A random sample of 40 drivers under 25 had a mean of 1.2 accidents per year with a standard deviation of .1. A sample of 40 drivers over 25 had a mean of .94 accidents per year with a standard deviation of .2. From this data can we conclude the Insurance companies are correct...
The breaking strengths of cables produced by a certain manufacturer have a mean, p, of 1750 pounds, and a standard deviation of 100 pounds. It is claimed that an improvement in the manufacturing process has increased the mean breaking strength. To evaluate this claim, 150 newly manufactured cables are randomly chosen and tested, and their mean breaking strength is found to be 1760 pounds. Can we support, at the 0.05 level of significance, the claim that the mean breaking strength...
The records show that the lifetimes of electric bulbs manufactured in the past by BIG Corporation have a mean of 8840 hours and a variance of 15783. The corporation claims that the current variance, c?, is less than 15783 following some adjustments in its production unit. A random sample of 31 bulbs from the current production lot has a mean lifetime of 8842 hours, with a variance of 11977. Assume that the lifetimes of recently manufactured bulbs are approximately normally...
Past records suggest that the mean annual income, 12, of teachers in state of Georgia is greater than or equal to the mean annual income, H2, of teachers in Indiana. In a current study, a random sample of 15 teachers from Georgia and an independent random sample of 15 teachers from Indiana have been asked to report their mean annual income. The data obtained are as follows. Annual income in dollars Georgia 35563, 41690, 51807, 41824, 35509, 35642, 31758, 46318,...
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