## Question A manufacturer is interested in the output voltage of a power supply used in a PC. Output voltage is assumed to be normally d

Question

Question
A manufacturer is interested in the output voltage of a power supply used in a PC. Output voltage is assumed to be normally distributed, with standard deviation 0.25 Volts, and the manufacturer wishes to test H0: μ = 5 Volts against H1: μ ≠ 5 Volts, using n = 8 units. If the sample mean is x¯¯=4.85 what can you say about the population mean with a=0.05 significance level ?

in progress 0
1 week 2021-09-12T13:22:33+00:00 1 Answer 0

The population mean is 5 volts

Step-by-step explanation:

Output voltage is assumed to be normally distributed, with standard deviation 0.25 Volts

s=0.25

n = 8

Sample mean =

Since n < 30 and population standard deviation is unknown

So, we will use t test

Formula :

t=-1.69

Refer the t table for p value

Degree of freedom = n-1 = 8-1 = 7

So,

P value >α

So, We are failed to reject null hypothesis

Hence The population mean is 5 volts