ge dverage, Voltage interval × ± given variation, with a given level of confidence. Suppose you desire the true voltage to be within 0.01V of the collected data average with 90% confidence, i.e. x ± Za/2° = x + 0.01V - Za12 = 0.01V Set p = 0.9 Determine a/2 = (1 - p)/2 Do reverse lookup in a Z table, or use Excel function NORM.INV(0.95,0,1). Also, you must have a value for O, the population standard deviation. For this question, assume it is 0.028. Next, rearrange the equation to solve for N.

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In this exercise you will determine how many data values you’ll need to collect so that the true voltage is within the given variation from the collected data average, i.e. the true voltage is within the interval  ± given variation, with a given level of confidence.

Suppose you desire the true voltage to be within 0.01V of the collected data average with 90% confidence, i.e.

 

 

 

Set p = 0.9

Determine α/2 = (1 - p)/2Do reverse lookup in a Z table, or use Excel function NORM.INV(0.95,0,1). Also, you must have a value for σ, the population standard deviation. For this question, assume it is 0.028.

Next, rearrange the equation to solve for N.

In this exercise you will determine how many data values you'll need to collect so that the true
voltage is within the given variation from the collected data average, i.e. the true voltage is within the
interval X + given variation, with a given level of confidence.
Suppose you desire the true voltage to be within 0.01V of the collected data average with 90% confidence, i.e.
X + Za/2
= x + 0.01V
N
= 0.01V
N.
Set p = 0.9
Determine a/2 = (1 - p)/2
Do reverse lookup in a Z table, or use Excel function NORM.INV(0.95,0,1). Also, you must have a value for 0, the
population standard deviation. For this question, assume it is 0.028.
Next, rearrange the equation to solve for N.
Transcribed Image Text:In this exercise you will determine how many data values you'll need to collect so that the true voltage is within the given variation from the collected data average, i.e. the true voltage is within the interval X + given variation, with a given level of confidence. Suppose you desire the true voltage to be within 0.01V of the collected data average with 90% confidence, i.e. X + Za/2 = x + 0.01V N = 0.01V N. Set p = 0.9 Determine a/2 = (1 - p)/2 Do reverse lookup in a Z table, or use Excel function NORM.INV(0.95,0,1). Also, you must have a value for 0, the population standard deviation. For this question, assume it is 0.028. Next, rearrange the equation to solve for N.
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