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(10 points; 10 minutes) 16. The data below are for a random sample of people "5 years old or less" and another random sample of people "Older than 5 years". Use the data to test t...
Fifty years ago, only 10% of state population consisted of people older than 70 years old....
Fifty years ago, only 10% of state population consisted of people older than 70 years old. A researcher plans to use a sample of n = 500 people to determine whether the population distribution has changed during the past fifty years. If a Chi-square test is used to evaluate the data, what is the expected frequency for the older-than-70 years old category? A. 20 B. 30 C. 40 D. 50 E. None of the above.
Years ago only 24% of the US. population consisted of people older than 62 years old....
Years ago only 24% of the US. population consisted of people older than 62 years old. A researcher plans to use a sample of 500 people to determine whether the population distribution has changed during the past ten years. If a chi-square test is used to evaluate the data, what is the expected value for the older-than-62 category? Select one: 62 120 240 50
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.
Conduct a hypothesis test for each problem, using the traditional method. Show the 5 steps and al...
Conduct a hypothesis test for each problem, using the traditional method. Show the 5 steps and all work for each hypothesis test. Be sure you select the correct test to use for each problem. 1. A telephone company claims that less than 30% of all college students have a limited number of text messages per month. A random sample of 150 students revealed that 41 of them have a limited number. Test the company's claim at the 0.01 level of...
Alocal retailer daims that the mean waiting time is less than 5 minutes. A random sample...
Alocal retailer daims that the mean waiting time is less than 5 minutes. A random sample of 20 waiting times has a mean of 3.5 minutes with a standard deviation of 21 minutes. Ata -0.01, test the retailer's claim. Assume the distribution is normally distributed The test statistic was calculated to be 3.194 and the critical value from the distribution table is 2.539. What decision and conclusion can you make? Reject the wil hypothesis, there is enough evidence to conclude...
A manufacturer of storm windows randomly sampled 14 new (less than five years of age) homes...
A manufacturer of storm windows randomly sampled 14 new (less than five years of age) homes and found that 8 of them had storm windows. Another random sample of 320 older (at least five years of age) homes was taken; 150 of them had storm windows. (a) With α 0.07, test whether more new homes have storm windows that older ones (b) Find a 99% confidence interval for the difference between the proportion of new homes with storm windows and...
Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic t....
Assume that a simple random sample has been selected
from a normally distributed population. Find the test statistic
t.
Test the claim that the mean age of the prison population in one
city is less than 26 years. Sample data are summarized as and Use a
significance level of Find the test
statistic t.
Question options:
A)
-0.87
B)
-4.35
C)
0.87
D)
1.87
E)
-1.87
The recommended daily dietary allowance for zinc among males older than age 50 years is 15...
The recommended daily dietary allowance for zinc among males older than age 50 years is 15 mg/day. An article reports the following summary data on intake for a sample of males age 65-74 years: 2 = 111, x = 12.8, and $ = 6.70. Does this data indicate that average daily zinc intake in the population of all males age 65-74 falls below the recommended allowance? (Use a = 0.05.) State the appropriate null and alternative hypotheses. Horft = 15...
The recommended daily dietary allowance for zinc among males older than age 50 years is 15...
The recommended daily dietary allowance for zinc among males older than age 50 years is 15 mg/day. An article reports the following summary data on intake for a sample of males age 65-74 years: n = 118, x = 12.1, and s = 6.94. Does this data indicate that average daily zinc intake in the population of all males age 65-74 falls below the recommended allowance? (Use a = 0.05.) State the appropriate null and alternative hypotheses. 5:11 PM
A random sample of 40 binomial trials resulted in 16 successes. Test the claim that the...
A random sample of 40 binomial trials resulted in 16 successes. Test the claim that the population proportion of successes does not equal 0.50. Use a level of significance of 0.05. (a) Can a normal distribution be used for the p̂ distribution? Explain. Yes, np and nq are both less than 5.No, np is greater than 5, but nq is less than 5. No, nq is greater than 5, but np is less than 5.Yes, np and nq are both greater...
Years ago only 24% of the US. population consisted of people older than 62 years old. A researcher plans to use a sample of 500 people to determine whether the population distribution has changed during the past ten years. If a chi-square test is used to evaluate the data, what is the expected value for the older-than-62 category? Select one: 62 120 240 50
Alocal retailer daims that the mean waiting time is less than 5 minutes. A random sample of 20 waiting times has a mean of 3.5 minutes with a standard deviation of 21 minutes. Ata -0.01, test the retailer's claim. Assume the distribution is normally distributed The test statistic was calculated to be 3.194 and the critical value from the distribution table is 2.539. What decision and conclusion can you make? Reject the wil hypothesis, there is enough evidence to conclude...
A manufacturer of storm windows randomly sampled 14 new (less than five years of age) homes and found that 8 of them had storm windows. Another random sample of 320 older (at least five years of age) homes was taken; 150 of them had storm windows. (a) With α 0.07, test whether more new homes have storm windows that older ones (b) Find a 99% confidence interval for the difference between the proportion of new homes with storm windows and...
Assume that a simple random sample has been selected
from a normally distributed population. Find the test statistic
t.
Test the claim that the mean age of the prison population in one
city is less than 26 years. Sample data are summarized as and Use a
significance level of Find the test
statistic t.
Question options:
A)
-0.87
B)
-4.35
C)
0.87
D)
1.87
E)
-1.87
The recommended daily dietary allowance for zinc among males older than age 50 years is 15 mg/day. An article reports the following summary data on intake for a sample of males age 65-74 years: 2 = 111, x = 12.8, and $ = 6.70. Does this data indicate that average daily zinc intake in the population of all males age 65-74 falls below the recommended allowance? (Use a = 0.05.) State the appropriate null and alternative hypotheses. Horft = 15...
The recommended daily dietary allowance for zinc among males older than age 50 years is 15 mg/day. An article reports the following summary data on intake for a sample of males age 65-74 years: n = 118, x = 12.1, and s = 6.94. Does this data indicate that average daily zinc intake in the population of all males age 65-74 falls below the recommended allowance? (Use a = 0.05.) State the appropriate null and alternative hypotheses. 5:11 PM
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