Question 1

Find a 90 percent confidence interval for the difference between the proportions of group l and group 2.Let p₁ represent the population proportion of the people in group 1 who are in favor of new packaging,and let p₂ represent the population proportion of the people in group 2 who are in favor of new packaging.

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Question 2

Find a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2,where

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Question 3

Find a 95 percent confidence interval for μ₁ - μ₂,where (Assume equal population variances. )

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Question 4

Find a 95 percent confidence interval for μ₁ - μ₂,where (Assume equal population variances. )

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Question 5

Find a 95 percent confidence interval for the difference between the proportions of older and younger drivers who have tickets,where

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Question 6

We are testing the hypothesis that the proportion of winter-quarter profit growth is more than 2 percent greater for consumer industry companies (CON)than for banking companies (BKG).At α = .10,given that  can we reject the null hypothesis?

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Question 7

When we test H₀:p₁ - p₂≤ .01,H_A:p₁ - p₂>.01,at α = .05,where what is the standard deviation used to calculate the test statistic?

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Question 8

When testing H₀: μ₁ - μ₂ = 2,H_A: μ₁ - μ₂> 2,where what is the test statistic? (Assume unequal variances. )

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Question 9

When we test H₀: μ₁ ≤ μ₂,H_A: μ₁> μ₂ at α = .10,where can we reject the null hypothesis? (Assume equal variances. )

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Question 10

Calculate the pooled variance where sample 1 has data: 16,14,19,18,19,20,15,18,17,18;and sample 2 has data: 13,19,14,17,21,14,15,10,13,15.

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Question 11

Using a 90 percent confidence interval of [-.0076,.0276] for the difference between the proportions of failures in factory 1 and factory 2,where  can we reject the null hypothesis at α = .10?

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Question 12

Find a 98 percent confidence interval for the paired difference

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Question 13

When we test H₀: p₁ - p₂ ≤ .01,H_A: p₁ - p₂> .01 at α = .05 where can we reject the null hypothesis?

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Question 14

When we test H₀: μ₁ - μ₂ ≤ 0,H_A: μ₁ - μ₂> 0, ₁ = 15.4, ₂ = 14.5,s₁ = 2,s₂ = 2.28,n₁ = 35,and n₂ = 18 at α = .01,can we reject the null hypothesis? (Assume unequal variances. )

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Question 15

We are testing the hypothesis that the proportion of winter-quarter profit growth is more than 2 percent greater for consumer industry companies (CON)than for banking companies (BKG).At α = .10,given that  calculate the estimated standard deviation for the model.

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Question 16

Find a 95 percent confidence interval for the difference between means,where  Assume unequal variances.

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Question 17

Find a 95 percent confidence interval for μ₁ - μ₂,where Assume unequal variances.

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Question 18

When we test H₀: μ₁ ≤ μ₂,H_A: μ₁> μ₂ at α = .10,where what is the estimated pooled variance?

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Question 19

Sample 1 has data: 16,14,19,18,19,20,15,18,17,18;and sample 2 has data: 13,19,14,17,21,14,15,10,13,15.Testing the equality of means at α = .05,can we reject the null hypothesis? (Assume equal population variances. )

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Question 20

When we test H₀: μ₁ - μ₂ ≤ 0,H_A: μ₁ - μ₂> 0, ₁ = 15.4, ₂ = 14.5,σ₁ = 2,σ₂ = 2.28,n₁ = 35,and n₂ = 18 at α = .01,what is the value of the test statistic?

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Quiz 10: Statistical Inferences Based on Two Samples

Find a 90 percent confidence interval for the difference between the proportions of failures in factory 1 and factory 2,where

Find a 95 percent confidence interval for μ1 - μ2,where (Assume equal population variances. )

Find a 95 percent confidence interval for μ1 - μ2,where (Assume equal population variances. )

Find a 95 percent confidence interval for the difference between the proportions of older and younger drivers who have tickets,where

We are testing the hypothesis that the proportion of winter-quarter profit growth is more than 2 percent greater for consumer industry companies (CON)than for banking companies (BKG).At α = .10,given that can we reject the null hypothesis?

When we test H0:p1 - p2≤ .01,HA:p1 - p2>.01,at α = .05,where what is the standard deviation used to calculate the test statistic?

When testing H0: μ1 - μ2 = 2,HA: μ1 - μ2> 2,where what is the test statistic? (Assume unequal variances. )

When we test H0: μ1 ≤ μ2,HA: μ1> μ2 at α = .10,where can we reject the null hypothesis? (Assume equal variances. )

Calculate the pooled variance where sample 1 has data: 16,14,19,18,19,20,15,18,17,18;and sample 2 has data: 13,19,14,17,21,14,15,10,13,15.

Using a 90 percent confidence interval of [-.0076,.0276] for the difference between the proportions of failures in factory 1 and factory 2,where can we reject the null hypothesis at α = .10?

Find a 98 percent confidence interval for the paired difference

When we test H0: p1 - p2 ≤ .01,HA: p1 - p2> .01 at α = .05 where can we reject the null hypothesis?

When we test H0: μ1 - μ2 ≤ 0,HA: μ1 - μ2> 0, 1 = 15.4, 2 = 14.5,s1 = 2,s2 = 2.28,n1 = 35,and n2 = 18 at α = .01,can we reject the null hypothesis? (Assume unequal variances. )

We are testing the hypothesis that the proportion of winter-quarter profit growth is more than 2 percent greater for consumer industry companies (CON)than for banking companies (BKG).At α = .10,given that calculate the estimated standard deviation for the model.

Find a 95 percent confidence interval for the difference between means,where Assume unequal variances.

Find a 95 percent confidence interval for μ1 - μ2,where Assume unequal variances.

When we test H0: μ1 ≤ μ2,HA: μ1> μ2 at α = .10,where what is the estimated pooled variance?

Sample 1 has data: 16,14,19,18,19,20,15,18,17,18;and sample 2 has data: 13,19,14,17,21,14,15,10,13,15.Testing the equality of means at α = .05,can we reject the null hypothesis? (Assume equal population variances. )

When we test H0: μ1 - μ2 ≤ 0,HA: μ1 - μ2> 0, 1 = 15.4, 2 = 14.5,σ1 = 2,σ2 = 2.28,n1 = 35,and n2 = 18 at α = .01,what is the value of the test statistic?

Find a 95 percent confidence interval for μ₁ - μ₂,where (Assume equal population variances. )

Find a 95 percent confidence interval for μ₁ - μ₂,where (Assume equal population variances. )

When we test H₀:p₁ - p₂≤ .01,H_A:p₁ - p₂>.01,at α = .05,where what is the standard deviation used to calculate the test statistic?

When testing H₀: μ₁ - μ₂ = 2,H_A: μ₁ - μ₂> 2,where what is the test statistic? (Assume unequal variances. )

When we test H₀: μ₁ ≤ μ₂,H_A: μ₁> μ₂ at α = .10,where can we reject the null hypothesis? (Assume equal variances. )

When we test H₀: p₁ - p₂ ≤ .01,H_A: p₁ - p₂> .01 at α = .05 where can we reject the null hypothesis?

When we test H₀: μ₁ - μ₂ ≤ 0,H_A: μ₁ - μ₂> 0, ₁ = 15.4, ₂ = 14.5,s₁ = 2,s₂ = 2.28,n₁ = 35,and n₂ = 18 at α = .01,can we reject the null hypothesis? (Assume unequal variances. )

Find a 95 percent confidence interval for μ₁ - μ₂,where Assume unequal variances.

When we test H₀: μ₁ ≤ μ₂,H_A: μ₁> μ₂ at α = .10,where what is the estimated pooled variance?

When we test H₀: μ₁ - μ₂ ≤ 0,H_A: μ₁ - μ₂> 0, ₁ = 15.4, ₂ = 14.5,σ₁ = 2,σ₂ = 2.28,n₁ = 35,and n₂ = 18 at α = .01,what is the value of the test statistic?