Do not round intermediate cacluations. Use Excel to obtain p-values. Round p-val

Question

Do not round intermediate cacluations. Use Excel to obtain p-values. Round p-values to four decimals and include the leading zero. Example: 0.0025

A federal agency responsible for enforcing laws governing weights and measures routinely inspects packages to determine whether the weight of the contents is at least as great as that advertised on the package. A random sample 18 containers whose packaging states that the contents weigh 8 ounces was drawn. The contents were weighed and recorded. The sample mean was 7.96 ounces and the sample standard deviation is 0.085 ounces. Assume the population of weights is normally distributed.

Explanation / Answer

here std error =std deviation/(n)1/2 =0.020035

hence test stat t =(X-mean)/std error =(7.96-8)/0.02=-1.9964

for above test stat and 17 degree of freedom ; p value =0.0311

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