Asked by Levileft1
1.A recent poll of 1800 people showed that 35% believe gas prices will go down. Find the best point estimate of the proportion of all people who believe gas prices will go down.
A 35
B .30
C .65
D .35
2. A researcher wants to estimate the mean rade point average of all current college students in the United States. She has eveloped a procedure to standardize scores from colleges using something ther than a scale between 0 and 4. How many grade point averages must be btained so that the sample mean is within 0.1 of the population mean? Assume hat a 90% confidence level is desired. Also assume that a pilot study showed hat the population standard deviation is 0.88. A15
B 298
C 1
D • 210
3. Assume you want to construct a 98%
confidence interval with a sample of n = 10 from of a normally distributed
population. Find the critical value t a/2.
A • 2.764
B• 2.821
C• 1.383
D• 3.250
4. Construct a 99% confidence interval for the population standard deviation of white blood cell count (in cells per microliter).
Assume 7 random samples were selected from a population that has a normal distribution. The sample has a mean of 7.106 cells and a standard deviation of 2.019 cells
A• 1.098 < o < 4.973
B• 4.042 < o ≤ 21.170
C• 1.148 < o < 6.015
D• 1.319 < o ‹ 36.181
5. The standard deviation of duration times (in seconds) of the Old Faithful geyser is less than 40 sec. Identify the null hypothesis and alternative hypothesis in symbolic form.
A • HO: 0 < 40 sec; H1: 0 = 40 sec
B• HO: 0 = 40 sec; H1: 0 < 40 sec
C• HO: 0 = 40 sec; H1: 0 ≠ 40 sec
D• HO: 0 = 40 sec; H1: 0 > 40 sec
6.Clinical trials involved treating flu symptoms with a new medicine. Among 724 patients treated with the medicine, 72 experienced a side effect of nausea. The claim is that the rate of nausea is greater than the 6% rate #5 experienced by flu patients given a placebo. Find a test statistic of the proportion
A z=-1.41
B z=4.47
C z=4.53
D z= 1.41
7. A watch designer claims that men have wrist breadths with a mean equal to 9 cm. A simple random sample of wrist breadths of 72 men has a mean of 8.91 cm. The population standard deviation is 0.36 cm.
Assume a confidence level of a = 0.01. Find the value of the test statistic z using formula below
A 2.12
B -1.27
C 0.06
D -2.12
8. Use the following information to find the test statistic of the sample used to test the claim that FICO credit scores are greater than 675.n = 50, modifying above ×( with bar) = 719, s = 92
A t=-3.382
B t= 32.437
C t=3.382
D t=- 32.437
9. A simple random sample of 26 precipitation amounts has a standard deviation of 0.18. Find the test statistic, using a 0.01 significance level to test a claim that the standard deviation of all precipitation amounts is equal to 0.25.
A 13.478
B 18.000
C 12.960
D 48.225
10. In a test of a particular weight loss program weights of 40 subjects are recorded before and after the program. The before and-after weights result in a correlation coefficient of 0.876. Assuming a 0.05 significance level, find the critical values. Is there sufficient evidence to support the claim of a linear correlation between before-and-after weights?
A Critical values = 10.312; there is sufficient evidence to support a claim of a linear
B Critical values = +0.312; there is not sufficient evidence to support a claim of a linear
correlation between before-and-after weights.
C Critical values = +0.402; there is sufficient evidence to support a claim of a linear
correlation between before-and-after weights.
D Critical values = +0.402; there is not sufficient evidence to support a claim of a linear
correlation between before-and-after weights.
11. y (hat) = 2,060 - 0.186x is the line of
regression of a table of values comparing full-front crash repair costs to full-rear crash repair costs for a certain model sedan. Use the equation to predict the full-rear repair cost from a full-front repair cost of $4,594.
A 13,624
B 1,206
C 2,915
D 22,639
12. A linear model is given for the data in the table y=10x+1
X Y
1 9
2 21
3. 29
4. 41
5. 49
6. 61
7. 69
A 8
B -8
C -16
D 16
13. A scatterplot containing several values is found to have a linear regression R^2 value of 0.883, a quadratic regression R^2 value of 0.537, an exponential regression R^2 value of 0.492, and a logarithmic regression R^2 value of 0.912. Which mathematical model best fits the scatterplot?
A linear model
B quadratic model
C exponential model
D logarithmic model
A 35
B .30
C .65
D .35
2. A researcher wants to estimate the mean rade point average of all current college students in the United States. She has eveloped a procedure to standardize scores from colleges using something ther than a scale between 0 and 4. How many grade point averages must be btained so that the sample mean is within 0.1 of the population mean? Assume hat a 90% confidence level is desired. Also assume that a pilot study showed hat the population standard deviation is 0.88. A15
B 298
C 1
D • 210
3. Assume you want to construct a 98%
confidence interval with a sample of n = 10 from of a normally distributed
population. Find the critical value t a/2.
A • 2.764
B• 2.821
C• 1.383
D• 3.250
4. Construct a 99% confidence interval for the population standard deviation of white blood cell count (in cells per microliter).
Assume 7 random samples were selected from a population that has a normal distribution. The sample has a mean of 7.106 cells and a standard deviation of 2.019 cells
A• 1.098 < o < 4.973
B• 4.042 < o ≤ 21.170
C• 1.148 < o < 6.015
D• 1.319 < o ‹ 36.181
5. The standard deviation of duration times (in seconds) of the Old Faithful geyser is less than 40 sec. Identify the null hypothesis and alternative hypothesis in symbolic form.
A • HO: 0 < 40 sec; H1: 0 = 40 sec
B• HO: 0 = 40 sec; H1: 0 < 40 sec
C• HO: 0 = 40 sec; H1: 0 ≠ 40 sec
D• HO: 0 = 40 sec; H1: 0 > 40 sec
6.Clinical trials involved treating flu symptoms with a new medicine. Among 724 patients treated with the medicine, 72 experienced a side effect of nausea. The claim is that the rate of nausea is greater than the 6% rate #5 experienced by flu patients given a placebo. Find a test statistic of the proportion
A z=-1.41
B z=4.47
C z=4.53
D z= 1.41
7. A watch designer claims that men have wrist breadths with a mean equal to 9 cm. A simple random sample of wrist breadths of 72 men has a mean of 8.91 cm. The population standard deviation is 0.36 cm.
Assume a confidence level of a = 0.01. Find the value of the test statistic z using formula below
A 2.12
B -1.27
C 0.06
D -2.12
8. Use the following information to find the test statistic of the sample used to test the claim that FICO credit scores are greater than 675.n = 50, modifying above ×( with bar) = 719, s = 92
A t=-3.382
B t= 32.437
C t=3.382
D t=- 32.437
9. A simple random sample of 26 precipitation amounts has a standard deviation of 0.18. Find the test statistic, using a 0.01 significance level to test a claim that the standard deviation of all precipitation amounts is equal to 0.25.
A 13.478
B 18.000
C 12.960
D 48.225
10. In a test of a particular weight loss program weights of 40 subjects are recorded before and after the program. The before and-after weights result in a correlation coefficient of 0.876. Assuming a 0.05 significance level, find the critical values. Is there sufficient evidence to support the claim of a linear correlation between before-and-after weights?
A Critical values = 10.312; there is sufficient evidence to support a claim of a linear
B Critical values = +0.312; there is not sufficient evidence to support a claim of a linear
correlation between before-and-after weights.
C Critical values = +0.402; there is sufficient evidence to support a claim of a linear
correlation between before-and-after weights.
D Critical values = +0.402; there is not sufficient evidence to support a claim of a linear
correlation between before-and-after weights.
11. y (hat) = 2,060 - 0.186x is the line of
regression of a table of values comparing full-front crash repair costs to full-rear crash repair costs for a certain model sedan. Use the equation to predict the full-rear repair cost from a full-front repair cost of $4,594.
A 13,624
B 1,206
C 2,915
D 22,639
12. A linear model is given for the data in the table y=10x+1
X Y
1 9
2 21
3. 29
4. 41
5. 49
6. 61
7. 69
A 8
B -8
C -16
D 16
13. A scatterplot containing several values is found to have a linear regression R^2 value of 0.883, a quadratic regression R^2 value of 0.537, an exponential regression R^2 value of 0.492, and a logarithmic regression R^2 value of 0.912. Which mathematical model best fits the scatterplot?
A linear model
B quadratic model
C exponential model
D logarithmic model
Answers
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