From the data given what would be the correct p value? (the one tail or the two tail?) 2. Find the point estimate (you can do this by subtracting Group 2 Sample Mean from Group 1 Sample Mean.) 3. Find the Lower Bound of the confidence interval by subtracting the Margin of Error from the point estimate. 4. Find the Upper Bound by adding the margin of error to the point estimate.
This chart shows the results of two random samples that measured the average number of minutes per charge for AA Lithium-ion (Li-ion) rechargeable batteries versus Nickel-Metal Hydride (NiMH) rechargeable batteries. Down below shows the hypothesis test using significance level (α) = 0.05 to determine if the true average number of minutes per charge for NiMH batteries is smaller than that for Li-ion batteries.
1. From the data given what would be the correct p value? (the one tail or the two tail?)
2. Find the point estimate (you can do this by subtracting Group 2 Sample Mean from Group 1 Sample Mean.)
3. Find the Lower Bound of the confidence interval by subtracting the Margin of Error from the point estimate.
4. Find the Upper Bound by adding the margin of error to the point estimate.
| t-Test: Two-Sample Assuming Unequal Variances | |||
| NiMH | Li-ion | ||
| Mean | 89.35714 | 95 | |
| Variance | 3.93956 | 59.75 | |
| Observations | 14 | 17 | |
| Hypothesized Mean Difference | 0 | ||
| df | 19 | ||
| t Stat | -2.89621 | ||
| P(T<=t) one-tail | 0.004628 | ||
| t Critical one-tail | 1.729133 | ||
| P(T<=t) two-tail | 0.009255 | ||
| t Critical two-tail | 2.093024 |
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