In order to test whether the average waiting time this year differs from last year, a sample of 25 data were collected this year with a mean of 0.74 hours and standard deviation 0.22 hours. Calculate the 99% confidence interval for the true waiting time for banking service this year.

a. 0.74 ± 2.57 x 0.22/√25
b. 0.74 ± 2.797 x 0.22/√25
c. 0.74 ± 2.797 x 0.22/√24
d. 0.74 ± 2.787 x 0.22/√25

(B) 0.74 + or - 2.797 × 0.22/√25

Step-by-step explanation:

Confidence Interval = mean + or - t × sd/√n

mean = 0.74 hours

sd = 0.22 hours

n = 25

degree of freedom = n - 1 = 25 - 1 = 24

Confidence level = 99%

t-value corresponding to 24 degrees of freedom and 99% confidence level is 2.797

Confidence Interval = 0.74 + or - 2.797 × 0.22/√25

answer

106 emergencies

step-by-step explanation:

b.-4 units

all you   do is count how many times you move