Question

The alkaline batteries of a toy car were designed to last 30 hours, on average. However lots of customers complained that the batteries were lasting less than 30 hours. You decided to randomly sample 38 of the batteries. The mean of the sample was 29.3 hours, and the sample standard deviation was 2.8 hours. Is there sufficient evidence to support the claim that the mean battery life is less than 30 hours? Perform a hypothesis at the 5% significance level.

Name: the alkaline batteries of a toy car were designed to last 30 hours on average however lots of customers complained that the batteries were lasting less than 30 hours you decided to randomly 53496
Uploaded: 2022-08-11T11:30:04-08:00
Duration: 2 min 13 s
Channel: Adi S
Description: the alkaline batteries of a toy car were designed to last 30 hours on average however lots of customers complained that the batteries were lasting less than 30 hours you decided to randomly 53496

          The alkaline batteries of a toy car were designed to last 30
hours, on average. However lots of customers complained that the
batteries were lasting less than 30 hours. You decided to randomly
sample 38 of the batteries. The mean of the sample was 29.3 hours,
and the sample standard deviation was 2.8 hours. Is there
sufficient evidence to support the claim that the mean battery life
is less than 30 hours? Perform a hypothesis at the 5% significance
level.

Added by Mireia K.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert Adi S

08/11/2022

Step 1

Null Hypothesis (H0): The mean battery life is 30 hours. Alternative Hypothesis (H1): The mean battery life is less than 30 hours. ** Show more…

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The alkaline batteries of a toy car were designed to last 30 hours, on average. However lots of customers complained that the batteries were lasting less than 30 hours. You decided to randomly sample 38 of the batteries. The mean of the sample was 29.3 hours, and the sample standard deviation was 2.8 hours. Is there sufficient evidence to support the claim that the mean battery life is less than 30 hours? Perform a hypothesis at the 5% significance level.