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8) In one town, monthly incomes for men with college degrees are found to have a...
In one town, monthly incomes for men with college degrees are found to have a standard...
In one town, monthly incomes for men with college degrees are found to have a standard deviation of $650. Use a 0.01 significance level to test the claim that for men without college degrees in that town, incomes have a higher standard deviation. A random sample of 22 men without college degrees resulted in incomes with a standard deviation of $913. A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted...
) In one town, monthly incomes for men with college degrees are found to have a...
) In one town, monthly incomes for men with college degrees are found to have a standard deviation of $650. Use a 0.01 significance level to test the claim that for men without college degrees in that town, incomes have a higher standard deviation. A random sample of 22 men without college degrees resulted in incomes with a standard deviation of $973. a) State claim: b) Test statistic: (identify to two decimals) and critical value: (identify to two decimals) c)...
A manufacturer uses a new production method to produce steel rods. A random sample of 17...
A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted in lengths with a standard deviation of 4.7 cm. At the 0.10 significance level, test the claim that the new production method has lengths with a standard deviation different from 3.5 cm, which was the standard deviation for the old method In one town, monthly incomes men with college degrees are found to have a standard deviation of $650. Use a...
At a college, 61 female students were randomly selected and it was found that their monthly...
At a college, 61 female students were randomly selected and it was found that their monthly income had a standard deviation of $230.85. For 121 male students, the standard deviation was $320.53. Test the claim that variance of monthly incomes is higher for male students than it is foi female students. Use a = 0.01.
In a sample of 167 children selected randomly from one town, it is found that 37...
In a sample of 167 children selected randomly from one town, it is found that 37 of them suffer from asthma. At the 0.05 significance level, test the claim that the proportion of all children in the town who suffer from asthma is 11%. An article in a journal reports that 34% of American fathers take no responsibility for child care. A researcher claims that the figure is higher for fathers in the town of Littleton. A random sample of...
In a sample of 88 adults selected randomly from one town, it is found that 6...
In a sample of 88 adults selected randomly from one town, it is found that 6 of them have been exposed to a particular strain of the flu. At the 0.01 significance level, test the claim that the proportion of all adults in the town that have been exposed to this strain of the flue differs from the nationwide percentage of 8%. H0: p = 0.08 HA: p ≠ 0.08. α = 0.01 Test statistic: z = -0.41. P-Value =...
8. A study found that the mean stopping distance of a school bus traveling 50 miles...
8. A study found that the mean stopping distance of a school bus traveling 50 miles per hour was 264 feet. A group of automobile engineers decided to conduct a study of its school buses and found that for 20 buses, the mean stopping distance of the buses was 262.3 feet. The standard deviation of the population was 3 feet. Test the claim that the mean stopping distance of the company’s buses is actually less than 264 feet. Use a...
In a sample of 167 children selected randomly from one town, it is found that 37...
In a sample of 167 children selected randomly from one town, it is found that 37 of them suffer from asthma. At the 0.05 significance leveltest the claim that the proportion of all children in the town who suffer from asthma is 11%. A public bus company official claims that the mean waiting time for bus number 14 during peak hours is less than 10 minutes. Karen took bus number 14 during peak hours on 18 different occasions. Her mean...
9. A research study measured the pulse rates of 37 randomly chosen college men and found...
9. A research study measured the pulse rates of 37 randomly chosen college men and found a mean pulse rate of 70 beats per minute with a standard deviation of 7.85 beats per minute. Researchers want to know if the mean pulse rate for all college men is different from the current standard of 72 beats per minute. Assume that pulse rates are normally distributed. Test at 0.05 level of significance to prove the researcher's claim. (12 pts)
A researcher claimed that a higher proportion of women than men exercise regularly. A random sample...
A researcher claimed that a higher proportion of women than men exercise regularly. A random sample of 150 men found that 88 of the men exercise regularly, while a random sample of 200 women found that 130 of the women exercise regularly. Test this claim using a significance level of 0.01. What is the z-stat? What is the p-value? What is your decision for the hypothesis test above? Retain or reject Ho? Please write a statement that summarizes your findings...
In one town, monthly incomes for men with college degrees are found to have a standard deviation of $650. Use a 0.01 significance level to test the claim that for men without college degrees in that town, incomes have a higher standard deviation. A random sample of 22 men without college degrees resulted in incomes with a standard deviation of $913. A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted...
At a college, 61 female students were randomly selected and it was found that their monthly income had a standard deviation of $230.85. For 121 male students, the standard deviation was $320.53. Test the claim that variance of monthly incomes is higher for male students than it is foi female students. Use a = 0.01.
In a sample of 167 children selected randomly from one town, it is found that 37 of them suffer from asthma. At the 0.05 significance level, test the claim that the proportion of all children in the town who suffer from asthma is 11%. An article in a journal reports that 34% of American fathers take no responsibility for child care. A researcher claims that the figure is higher for fathers in the town of Littleton. A random sample of...
9. A research study measured the pulse rates of 37 randomly chosen college men and found a mean pulse rate of 70 beats per minute with a standard deviation of 7.85 beats per minute. Researchers want to know if the mean pulse rate for all college men is different from the current standard of 72 beats per minute. Assume that pulse rates are normally distributed. Test at 0.05 level of significance to prove the researcher's claim. (12 pts)
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