Arecent study in a small city stated that the average age of robbery victims was 63.5 years. a sample of 20 recent victims had a mean of 63.7 years and a standard deviation of 1.9 years. at α =0.01, is the average age higher than originally believed? make sure to write down the hypotheses, claim, critical value, test statistic, decision and conclusion

No, the average age is not higher than originally believed.

Step-by-step explanation:

Since we have given that

Sample size = 20

Mean = 63.7 years

Standard deviation = 1.9 years

So, Hypothesis:

So, the value of test statistic would be

At α = 0.01 level of significance,

critical value z = 2.58

Since 2.58>0.471

so, We will accept the null hypothesis.

Hence, No, the average age is not higher than originally believed.

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step-by-step explanation: