Question

In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $46 and standard deviation of $12. Estimate how much a typical parent would spend on their child's birthday gift (use a 98% confidence level).

Give your answers to one decimal place. Provide the point estimate and margin or error.

±±

Do you add ( ) when answering?

Answer 1

Solution 元 の 下 ZUOF , baseria Given that point estimate = Sample mean= 46 Sample standard deviation - 12 Sample size = n=22 degrees of freedom = df-n-1=224 = 21 At 98% confidence level the t is wo 1711 i d=1-98% = 1-0,98=0.02 vow todo, df = to 10%, 21 = 2.518 *15 Margin of coool = ME = I ta, at +2.518 * () GOES DOCUF OLDO F ME & I 6.4 of 2 SAADA DO PROF oruq qus