6. You are constructing a 90% confidence interval for a sample consisting of n = 9 values and an

unknown population standard deviation. The population appears to be very skewed. Determine

whether a margin of error should be calculated using a critical value of za/2, a critical value of ta/2, or neither.

a) a critical value of za/2

b) a critical value of ta/2

c) neither

7. The standard deviation of sample size of n = 15 is 345 and the mean is 6784. Given that the population follows a normal distribution, construct a 90% confidence interval estimate of the mean of the population.

a) 6519
b) 6593
c) 6627
d)6783

Bonnie and bobby are saving money for a vacation. each friend starts with an amount and also saves a specific amount each week. bonnie created a table to show the total she has saved at the end of each week.. weeks 0 1 2 3 4 5 6 7 8 amount saved 12 16 20 24 28 32 36 40 44 bobby came up with the following equation to show the total, y, he has saved at the end of each week, x. y = 12x + 4 compare the rate at which each friend saves money. select the correct answer from the drop-down menu to complete the statement. the rate at which bobby is adding to his savings each week is $ more than the rate at which bonnie is adding to her savings each week.