Bob has a bulb factory that produces two types of bulbs: white light (x) and color light (y). It is known that the standard deviation of service life for the population of white light bulbs is o, = 14 hours and o, = 13 hours for color bulbs, both are normally distributed. He tested the mean service life of those two types of bulbs by randomly drawing a sample of 20 bulbs from each type. The estimated mean service life are = 960 hours and y = 945 hours. Assume that cov(a, j) = 0 What is the absolute value of the t- statistic if the null hypothesis is that both types of bulbs have the same service life? Select one: O a. 0.76 b. 0.77 с. 3.51 d. 3.28 Oe. 12.9

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Bob has a bulb factory that produces two types of bulbs: white light (x) and color light (y). It is known that the standard deviation of service
life for the population of white light bulbs is o
tested the mean service life of those two types of bulbs by randomly drawing a sample of 20 bulbs from each type. The estimated mean
service life are a
14 hours and oy
= 13
hours for color bulbs, both are normally distributed. He
960
hours and y = 945
hours. Assume that cov(, j) = 0
What is the absolute value of the t-
statistic if the null hypothesis is that both types of bulbs have the same service life?
Select one:
а.
0.76
b. 0.77
С.
3.51
d. 3.28
е.
12.9
Transcribed Image Text:Bob has a bulb factory that produces two types of bulbs: white light (x) and color light (y). It is known that the standard deviation of service life for the population of white light bulbs is o tested the mean service life of those two types of bulbs by randomly drawing a sample of 20 bulbs from each type. The estimated mean service life are a 14 hours and oy = 13 hours for color bulbs, both are normally distributed. He 960 hours and y = 945 hours. Assume that cov(, j) = 0 What is the absolute value of the t- statistic if the null hypothesis is that both types of bulbs have the same service life? Select one: а. 0.76 b. 0.77 С. 3.51 d. 3.28 е. 12.9
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