Astudy was conducted to determine if the salaries of librarians from two neighboring cities were equal. a sample of 15 librarians from each city was randomly selected. the mean from the first city was $28,900 with a standard deviation of $2300. the mean from the second city was $30,300 with a standard deviation of $2100. construct a 95% confidence interval for u1 -u2.
a.) (-4081, 597)
b.) (-2054, 238)
c.) (-2871, 567)
d.) (-3125, 325)

answer: 94

step-by-step explanation: 79+91+92+94+94 = 450 divided by 5 (since there are 5 number that are being added) = 90

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c