One step tests of hypothesis An insurance company, based on past experience, estimates the mean dama

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One step tests of hypothesis

An insurance company, based on
past experience, estimates the mean damage for a natural disaster in its area
is $5,000 After introducing several plans to prevent loss, it randomly samples
200 policy holders and finds the mean amount per claim was $4,800 with a
standard deviation of $1,300, Does it appears the prevention plans were
effective in reducing the mean amount of a claim? Use the significance level

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