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Pani-rosa [81]
3 years ago
9

normally distributed with an unknown population mean and a population standard deviation of 4.5 points. A random sample of 45 sc

ores is taken and gives a sample mean of 84. Find a 90% confidence interval
Mathematics
1 answer:
shusha [124]3 years ago
3 0

Answer:

= ( 82.90, 85.10) points

Therefore at 90% confidence interval (a,b)= ( 82.90, 85.10) points

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 = 84

Standard deviation r = 4.5

Number of samples n = 45

Confidence interval = 90%

z(at 90% confidence) = 1.645

Substituting the values we have;

84+/-1.645(4.5/√45)

84+/-1.645(0.670820393249)

84+/-1.10

= ( 82.90, 85.10) points

Therefore at 90% confidence interval (a,b)= ( 82.90, 85.10) points

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<h3>What is the triangle?</h3>

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Then the correct option is C.

The complete question is given below.

Use the diagram showing m || n, as well as the relationships between interior and exterior angles of ΔABC, to answer the questions.

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More about the triangle link is given below.

brainly.com/question/25813512

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