D 7.5
Question 3
10 Point
Two owners of a cattle ranch, Robert and Val, want to find the average weight for the ranch's 200 cows. Instead
weighing all of the cows:
- Robert weighs 25 cows and gets an average weight of 1,550 pounds (stdev = 50)
• Val weighs 100 cows and gets an average weight of 1 380 pounds (stdev = 50)
IB
what is Val's margin of error, rounded to the nearest whole number (The formula is 1.96 (sta dev) VN
A) 0.98
B
3.92

Aresearch company wants to test the claim that a new multivitamin to improve short term memory. state the objective of the experiment, suggest a population, determine the experimental and control groups, and describe a sample procedure.

The average hourly earnings for a construction worker is projected to be $24.50 in 2012. jason wants to join the construction work force after he graduates in 2012. his friend tells him that average hourly earnings for construction workers will rise by 2% from 2009 to 2012. based on the data below, assuming that the projected hourly earnings are correct, is jason’s friend’s statement accurate? construction industry - average hourly earnings, 2000-2009 a. his friend’s statement is accurate. the average hourly earnings will increase by 2%. b. his friend’s statement is not accurate. the percent increase will be more than 2% c. his friend’s statement is not accurate. the percent increase will be less than 2% d. his friend’s statement is not accurate. the average hourly earnings will decrease

Adifferent website gives the cost for the first train as £56.88 and the second train as £20.11 with a £9.50 charge for cycle storage for the whole trip. how much would the journey cost you?