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A labor market analyst believes the average income for the United States equals $43,000. Suppose she...
A hairdresser believes that she is more profitable on Tuesdays, her lucky day of the week. She knows that, on average, she has a daily revenue of $250. She randomly samples the revenue from eight Tuesdays and finds she takes in $260, $245, $270, $260, $29
A hairdresser believes that she is more profitable on Tuesdays, her lucky day of the week. She knows that, on average, she has a daily revenue of $250. She randomly samples the revenue from eight Tuesdays and finds she takes in $260, $245, $270, $260, $295, $235, $270, and $265. Assume that daily revenue is normally distributed.a. Specify the population parameter to be tested.b. Specify the null and alternative hypotheses to test the hairdresser’s claim.c. Calculate the sample mean revenue...
A market analyst believes that automobile preferences among consumers among the top ten manufacturers are uniform...
A market analyst believes that automobile preferences among consumers among the top ten manufacturers are uniform or equal. To test this, a random sample of 10,000 consumers is selected and asked to choose their preferred brand. The results are as follows: Observed Frequency Company or Brand of Preferences Fiat-Chrysler 857 Nissan 867 Ford 594 Tesla 936 GM 1568 Honda 885 BMW 816 Daimler 1418 Volkswagen 859 Toyota 1200...
A research service estimates that the mean annual consumption of fresh-market tomatoes by a person in...
A research service estimates that the mean annual consumption of fresh-market tomatoes by a person in the United States is less than 25 pounds. A random sample of 65 people in the United States has a mean annual consumption of fresh-market tomatoes of 22 pounds and a population standard deviation of 6 pounds. At α = 0.05, is there enough evidence to reject the service’s claim? a. Identify the claim and state H0 and Ha. b. Determine whether the hypothesis...
The mean income per person in the United States is $35,500, and the distribution of incomes...
The mean income per person in the United States is $35,500, and the distribution of incomes follows a normal distribution. A random sample of 8 residents of Wilmington, Delaware, had a mean of $39,500 with a standard deviation of $8,200. At the 0.010 level of significance, is that enough evidence to conclude that residents of Wilmington, Delaware, have more income than the national average? State the null hypothesis and the alternate hypothesis. State the decision rule for 0.010 significance level....
T test: 5) If a real estate market is strong, there will be a close relationship...
T test: 5) If a real estate market is strong, there will be a close relationship between the asking price for homes and the selling price. Suppose that one analyst believes that the mean difference between asking price and selling price for homes in a particular market area is less than $2000. To test this using an alpha level equal to .05, random sample of n=15 homes that have sold recently was selected. The difference between asking price and selling...
1. A researcher believes that the mean age of medical doctors in a large hospital is...
1. A researcher believes that the mean age of medical doctors in a large hospital is older than the average of doctors in the United States, which is 46. Assume the population standard deviation is 4.2 years. A random sample of 30 doctors from the system is selected, and the mean age of the sample is 48.6. Test the claim at a =0.01. (12 points → 2 points for each step) Show all steps. Step 1: State the question of...
Iron-deficiency anemia is an important nutritional health problem in the United States. A dietary as- sessment...
Iron-deficiency anemia is an important nutritional health problem in the United States. A dietary as- sessment was performed on 51 boys 9 to 11 years of age whose families were below the poverty level. The mean daily iron intake among these boys was found to be 12.50mg with standard deviation 4.75mg. Suppose the mean daily iron intake among a large population of 9 to 11 year-old boys from all income strata is 14.44 mg. We want to test whether the...
Q9- According to data from the Environmental Protection Agency, the average daily water consumption for a...
Q9- According to data from the Environmental Protection Agency, the average daily water consumption for a household of four people in the United States is at least 243 gallons. Suppose a state agency plans to test this claim using an alpha level equal to 0.05 and a random sample of 100 households with four people. Assume that the population standard deviation is known to be 40 gallons. Calculate the probability of committing a Type II error if the true population...
Young children in the United States are exposed to an average of 4 hours of background...
Young children in the United States are exposed to an average of 4 hours of background television per day. Having the television on in the background while children are doing other activities may have adverse consequences on a child’s well-being. You have a research hypothesis that children from low-income families are exposed to more than 4 hours of daily background television. In order to test this hypothesis, you have collected a random sample of 64 children from low-income families and...
The mean income per person in the United States is $39,500, and the distribution of incomes follows a normal distributio...
The mean income per person in the United States is $39,500, and the distribution of incomes follows a normal distribution. A random sample of 16 residents of Wilmington, Delaware, had a mean of $45,500 with a standard deviation of $9,800. At the 0.010 level of significance, is that enough evidence to conclude that residents of Wilmington, Delaware, have more income than the national average? A.) State the null hypothesis and the alternate hypothesis. B.)State the decision rule for 0.010 significance...
T test: 5) If a real estate market is strong, there will be a close relationship between the asking price for homes and the selling price. Suppose that one analyst believes that the mean difference between asking price and selling price for homes in a particular market area is less than $2000. To test this using an alpha level equal to .05, random sample of n=15 homes that have sold recently was selected. The difference between asking price and selling...
1. A researcher believes that the mean age of medical doctors in a large hospital is older than the average of doctors in the United States, which is 46. Assume the population standard deviation is 4.2 years. A random sample of 30 doctors from the system is selected, and the mean age of the sample is 48.6. Test the claim at a =0.01. (12 points → 2 points for each step) Show all steps. Step 1: State the question of...
Iron-deficiency anemia is an important nutritional health problem in the United States. A dietary as- sessment was performed on 51 boys 9 to 11 years of age whose families were below the poverty level. The mean daily iron intake among these boys was found to be 12.50mg with standard deviation 4.75mg. Suppose the mean daily iron intake among a large population of 9 to 11 year-old boys from all income strata is 14.44 mg. We want to test whether the...
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