A manufacturing firm claims that the batteries used in their electronic games will last an average...
A manufacturing firm claims that the batteries used in their electronic games will last an average of 20 hours. To maintain this average, 9 batteries are tested each month. If the computed t-value falls between – t0.025 and t0.025, the firm is satisfied with the claim. Assume the distribution of battery lives to be approximately normal.
What conclusion should the firm draw from a sample that has a mean
of x = 16 hours and a standard deviation of s = 5
hours?
| a. |
Claim not valid |
|
| b. |
Claim is valid |
|
| c. |
data too close to call |
|
| d. |
not enough information to decide |
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A manufacturing firm claims that the batteries used in their
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