A. Identify the test statistic. (round to three decimal places) B. Identify the

Question

A. Identify the test statistic. (round to three decimal places)

B. Identify the P Value (round to three decimal places)

Assume that a simple random sample has been selected from a normally distributed population and test the given claim. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. A safety administration conducted crash tests of child booster seats for cars. Listed below are results from those tests, with the measurements given in hic (standard head injury condition units). The safety requirement is that the hic measurement should be less than 1000 hic. Use a 0.01 significance level to test the claim that the sample is from a population with a mean less than 1000 hic. Do the results suggest that all of the child booster seats meet the specified requirement? 797 745 1183 676 580 645

Explanation / Answer

The statistical software output for this problem is:

One sample T hypothesis test:
: Mean of variable
H0 : = 1000
HA : < 1000

Hypothesis test results:

Hence,

A) Test statistic = -2.601

B) P - value = 0.024

Variable Sample Mean Std. Err. DF T-Stat P-value Data 771 88.029919 5 -2.6013883 0.0241

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