Question

In id survey of 5 people, it was found that an average of $47 was spent on their child's last birthday gift with a standard deviation of $5. Estimate the mean amount people spent on their child's last birthday gift with 80% confidence using the appropriate critical value to three decimal places. Enter your answer as equations or as numbers rounded to four decimal places. Lower bound of CI = Preview Upper bound of CI = Preview What conditions are required for the validity of the interval? Select ALL that apply. o known normal population He known random sample

Answer 1

Güven n=5 mean =47 S.D=5 Now; SE=S.D. = 2.2361 Interval the 80% of confidence t-value is , Degree of freedom anal : 25-1 =4. Significance = 1-0.80 = 0.2 By using of eq significance values 4-value = 1.53321 (tsing f-valie Corbeelator) Marginal Error (me) = f*SE =15332* 2-2361 S = 3.42-84

Mean amount of soy confidence internal is, Lower limit = mean - me 3 47- 3,4284. = 43.576 upper limit = mean time = 47+ 3.4284 2.-50.4284 e S0-4. Confidence Interral lies between (43.5716,50.4284) -) conditions are required for the validity of the Interval are to Normal population Random sample
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