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Step 1

Hello. Since your question has multiple sub-parts, we will solve first three sub-parts for you. If you want remaining sub-parts to be solved, then please resubmit the whole question and specify those sub-parts you want us to solve.

From the provided information, the hypothesis can be constructed as;
Null hypothesis; there is no significance difference between estimation of speed, H0:µ1= µ2

Alternative hypothesis; the “smashed into” group report higher estimates of speed than the “hit” group.

H0:µ1< µ2

Here µ1 and µ2 are the population mean of hit group and smashed into group respectively.

The sample size of hit group (n1) = 20

Consider x1 be a random variable which represents the hit speed.

The mean and standard deviation for hit group can be obtained as:

Step 2

Similarly, the sample size of hit group (n2) = 20

Consider x2 be a random variable which represents the smashed into speed.

The mean and standard deviation for smashed into group can be obtained as:

Step 3

5)   The value of the test st...

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