Mathematics, 21.04.2020 17:59 danizara8

A survey by American Express Spending reported that the average amount spent on a wedding gift for a close family member is $166. A random sample of 45 people who purchased wedding gifts for a close family member spent an average of $160.50. Assume that the population standard deviation is $38. Use a 95% confidence interval to test the validity of this report and choose the one statement that is correct.

a. Because this confidence interval does include $166, the report by American Express Spending is not validated.
b. Because this confidence interval does include $166, the report by American Express Spending is validated.
c. Because this confidence interval does not include $166, the report by American Express Spending is not validated.
d. Because this confidence interval does not include $166, the report by American Express Spending is validated.

Answers: 3

Show answers

Another question on Mathematics

Mathematics, 21.06.2019 17:30

Assume that 1400 births are randomly selected and 1378 of the births are girls. use subjective judgment to describe the number of girls as significantly high, significantly low, or neither significantly low nor significantly high. choose the correct answer below. a. the number of girls is neither significantly low nor significantly high. b. the number of girls is significantly high. c. the number of girls is significantly low. d. it is impossible to make a judgment with the given information.

Answers: 1

Answer

Mathematics, 21.06.2019 18:10

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

Answers: 2

Answer

Mathematics, 21.06.2019 18:30

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Answers: 2

Answer

Mathematics, 21.06.2019 20:00

Anature center offer 2 guided walks. the morning walk is 2/3 miles. the evening walk is 3/6 mile. which is shorter

Answers: 1

Answer

You know the right answer?

A survey by American Express Spending reported that the average amount spent on a wedding gift for a...

Questions