At 8am the temperature was 56°F by noon a storm had arrived and the temperature was 43°F which describes the change in the tempe
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Answer:
The teenagers spent 4.5 hours per week, on average, on the phone.
Step-by-step explanation:
We are given the following in the question:
Population mean, μ = 4.5
Sample mean, = 4.75
Sample size, n = 15
Alpha, α = 0.05
Sample standard deviation, s = 2
First, we design the null and the alternate hypothesis
We use one-tailed(right) t test to perform this hypothesis.
Formula:
Putting all the values, we have
Now,
Since,
We accept the null hypothesis. Thus, the teenagers spent 4.5 hours per week, on average, on the phone. The sample contradicted the organization's claim.