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Use a 0.05 significance level and conduct a full hypothesis test. List the null and alternative hypotheses, the z-score, the P-value, and whether to reject or not reject the null hypothesis. Round z-scores to the nearest tenth.
-A national car insurance company stated that in 1987, the average yearly car insurance cost for a family in the U.S. was $1716. In the same year, a random sample of 32 families in California resulted in a mean cost of $1728
with a standard deviation of $35.50. Test the claim that the average insurance cost for a family in California in 1987 exceeded the national average.
Senescence
The process of aging where the biological functions of an organism decline, leading to decreased ability to adapt to stress and increased risk of death.
Physical Appearance
The outward look or aspect of a person, including features, shape, and style of dress, which can influence social perceptions.
Spinal Disks
Cushion-like pads situated between vertebrae in the spine, acting as shock absorbers.
Muscles Weaken
A condition or process where the strength and function of muscles decrease, which can occur due to aging, inactivity, or disease.
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