Nationally, about 11% of the total U.S. wheat crop is destroyed each year by hail.T An insurance company is studying wheat hail damage claims in a county in Colorado. A random sample of 16 claims in the county reported the percentage of their wheat lost to hail. 6 11 10 12 22 13 10 7 10 23 19 13 13 7 13 3 The sample mean is x = 12.0%. Let x be a random variable that represents the percentage of wheat crop in that county lost to hail. Assume that x has a normal distribution and a = S.0%. Do these data indicate that the percentage of wheat crop lost to hail in that county is different (either way) from the national mean of 11%? Use a = 0.01. (a) What is the level of significance? State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? O Hoi H= 11%; Hạ: H < 11%; left-tailed O Hoi H= 11%; H: H= 11%; two-tailed O Ho: H 11%; H: H= 11%; two-tailed O Họ: H= 11%; H: H > 11%; right-tailed (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. O The standard normal, since we assume that x has a normal distribution with known a. O The Student's t, since n is large with unknown a. O The Student's t, since we assume that x has a normal distribution with known a. O The standard normal, since we assume that x has a normal distribution with unknown a. Compute the z value of the sample test statistic. (Round your answer to two decimal places.)

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
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Chapter11: Data Analysis And Probability
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Nationally, about 11% of the total U.S. wheat crop is destroyed each year by hail.† An insurance company is studying wheat hail damage claims in a county in Colorado. A random sample of 16 claims in the county reported the percentage of their wheat lost to hail.
13 6 11 10 12 22 13 10
7 10 23 19 13 7 13 3

I need help with sketching the sampling distribution, (d), and (e)

Sketch the sampling distribution and show the area corresponding to the P-value.
a
-2
-1
1
2
3
O-3
-2
-1
1
2
3
C
d
O-3
-2
-1
1
2
3
O-3
-2
-1
1
3
(d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Are the data statistically significant at level a?
O At the a = 0.01 level, we reject the null hypothesis and conclude the data are statistically significant.
O At the a = 0.01 level, we reject the null hypothesis and conclude the data are not statistically significant.
O At the a = 0.01 level, we fail to reject the null hypothesis and conclude the data are statistically significant.
O At the a = 0.01 level, we fail to reject the null hypothesis and conclude the data are not statistically significant.
(e) State your conclusion in the context of the application.
O There is sufficient evidence at the 0.01 level to conclude that the average hail damage to wheat crops in the county in Colorado differs from the national average.
O There is insufficient evidence at the 0.01 level to conclude that the average hail damage to wheat crops in the county in Colorado differs from the national average.
Transcribed Image Text:Sketch the sampling distribution and show the area corresponding to the P-value. a -2 -1 1 2 3 O-3 -2 -1 1 2 3 C d O-3 -2 -1 1 2 3 O-3 -2 -1 1 3 (d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Are the data statistically significant at level a? O At the a = 0.01 level, we reject the null hypothesis and conclude the data are statistically significant. O At the a = 0.01 level, we reject the null hypothesis and conclude the data are not statistically significant. O At the a = 0.01 level, we fail to reject the null hypothesis and conclude the data are statistically significant. O At the a = 0.01 level, we fail to reject the null hypothesis and conclude the data are not statistically significant. (e) State your conclusion in the context of the application. O There is sufficient evidence at the 0.01 level to conclude that the average hail damage to wheat crops in the county in Colorado differs from the national average. O There is insufficient evidence at the 0.01 level to conclude that the average hail damage to wheat crops in the county in Colorado differs from the national average.
Nationally, about 11% of the total U.S. wheat crop is destroyed each year by hail.t An insurance company is studying wheat hail damage claims in a county in Colorado. A random sample of
claims in the county reported the percentage of their wheat lost to hail.
13
11 10 12 22 13 10
7 10 23 19 13
7 13 3
The sample mean is x = 12.0%. Let x be a random variable that represents the percentage of wheat crop in that county lost to hail. Assume that x has a normal distribution and o = 5.0%. Do these data indicate that the percentage of wheat crop lost to hail in that
county is different (either way) from the national mean of 11%? Use a = 0.01.
(a) What is the level of significance?
State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test?
O Ho: H = 11%; H,: µ < 11%; left-tailed
O Ho: u = 11%; H,: µ # 11%; two-tailed
O Hn: µ + 11%; H,: µ = 11%; two-tailed
O Ho: H = 11%; H,: µ > 11%; right-tailed
(b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution.
O The standard normal, since we assume that x has a normal distribution with known o.
O The Student's t, sincen is large with unknown o.
O The Student's t, since we assume that x has a normal distribution with known o.
O The standard normal, since we assume that x has a normal distribution with unknown o.
Compute the z value of the sample test statistic. (Round your answer to two decimal places.)
Transcribed Image Text:Nationally, about 11% of the total U.S. wheat crop is destroyed each year by hail.t An insurance company is studying wheat hail damage claims in a county in Colorado. A random sample of claims in the county reported the percentage of their wheat lost to hail. 13 11 10 12 22 13 10 7 10 23 19 13 7 13 3 The sample mean is x = 12.0%. Let x be a random variable that represents the percentage of wheat crop in that county lost to hail. Assume that x has a normal distribution and o = 5.0%. Do these data indicate that the percentage of wheat crop lost to hail in that county is different (either way) from the national mean of 11%? Use a = 0.01. (a) What is the level of significance? State the null and alternate hypotheses. Will you use a left-tailed, right-tailed, or two-tailed test? O Ho: H = 11%; H,: µ < 11%; left-tailed O Ho: u = 11%; H,: µ # 11%; two-tailed O Hn: µ + 11%; H,: µ = 11%; two-tailed O Ho: H = 11%; H,: µ > 11%; right-tailed (b) What sampling distribution will you use? Explain the rationale for your choice of sampling distribution. O The standard normal, since we assume that x has a normal distribution with known o. O The Student's t, sincen is large with unknown o. O The Student's t, since we assume that x has a normal distribution with known o. O The standard normal, since we assume that x has a normal distribution with unknown o. Compute the z value of the sample test statistic. (Round your answer to two decimal places.)
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