You measure 49 textbooks' weights, and find they have a mean weight of 54 ounces. Assume the population standard deviation is 11.7 ounces. Based on this, construct a 95% confidence interval for the true population mean textbook weight. Use z = 2 for calculations

= ( 50.66, 57.34)

Step-by-step explanation:

Confidence interval can be defined as a range of values so defined that there is a specified probability that the value of a parameter lies within it.

The confidence interval of a statistical data can be written as.

x+/-zr/√n

Given that;

Mean x = 54 ounces

Standard deviation r = 11.7 ounces

Number of samples n = 49

Confidence interval = 95%

z(at 95% confidence) = 2

Substituting the values we have;

54+/-2(11.7/√49)

54+/-2(1.671428571428)

54+/-3.342857142857

54+/-3.34

= ( 50.66, 57.34)

Therefore, the 95% confidence interval (a,b)

= ( 50.66, 57.34)

Thanks

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.

step-by-step explanation:

for volume, add base x height x width