Six different national brands of chocolate chip cookies were randomly selected a

Question

Six different national brands of chocolate chip cookies were randomly selected at the supermarket. The grams of fat per serving are as follovrs: 9; 9 10; 7; 8; 8. Assume the underlying distribution is approximately normal. OTE: If you are using a Student's t-distribution, you may assume that the underlying population is normally distributed. (In general, you must first ove that assumption, though.) Part (a) Calculate a 90% confidence interval for the population average gams of fat per serving of chocolate chp cookies sold in Supermarkets 0) State the confidence interval (Round your answers to two decimal places) (0) Sketch the graph 05

Explanation / Answer

from above:

for 90% confidence interval ;and(n-1=5) degree of freedom ; t=2.0150

therefore 90% Confidence interval =sample mean -/+ t*std error =7.64 ; 9.36

X 9 9 10 7 8 8 mean(X) 8.500 std deviation(S) 1.0488 std error =S/(n)1/2 0.4282

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