# Question: What value of z should we use when making a 98% confidence interval for p?

How to Determine the Confidence Interval for a Population Proportion

Confidence Level z*-value
90% 1.645 (by convention)
95% 1.96
98% 2.33
99% 2.58

## What does 98% confidence mean in a 98% confidence interval?

Question: Explain What 98 % Confidence ” Means In A 98 % Confidence Interva What Does ” 98 % Confidence Mean In A 98 % Confidence Interval? The Probability That The Value Of The Parameter Ties Between The Lower And Upper Bounds Of The Interval Is 98 %.

## What is the 98% confidence interval?

Z-values for Confidence Intervals

Confidence Level Z Value
85% 1.440
90% 1.645
95% 1.960
98 % 2.326

## What is the z-score for 95%?

The Z value for 95 % confidence is Z =1.96. [Note: Both the table of Z – scores and the table of t- scores can also be accessed from the “Other Resources” on the right side of the page.] What is the 90% confidence interval for BMI? (Note that Z =1.645 to reflect the 90% confidence level.)

## What is the z-score of a 97 confidence interval?

B. Common confidence levels and their critical values

Confidence Level Critical Value ( Z – score )
0.95 1.96
0.96 2.05
0.97 2.17
0.98 2.33

## What does a 95% confidence interval mean?

What does a 95 % confidence interval mean? The 95 % confidence interval is a range of values that you can be 95 % confident contains the true mean of the population.

## How do I calculate 95% confidence interval?

To compute the 95 % confidence interval, start by computing the mean and standard error: M = (2 + 3 + 5 + 6 + 9)/5 = 5. σM = = 1.118. Z. 95 can be found using the normal distribution calculator and specifying that the shaded area is 0.95 and indicating that you want the area to be between the cutoff points.

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## What is the z-score of 98%?

Area in Tails

Confidence Level Area between 0 and z – score z – score
90% 0.4500 1.645
95% 0.4750 1.960
98 % 0.4900 2.326
99% 0.4950 2.576

## What is the z value of 99%?

Because 0.0495 is to the right of -1.6 and under 0.05, its standard score is -1.65. Thus Z α/2 = 1.645 for 90% confidence.

Confidence (1–α) g 100% Significance α Critical Value Z α/2
90% 0.10 1.645
95% 0.05 1.960
98% 0.02 2.326
99 % 0.01 2.576

## What is the z score of 92%?

Confidence Level z
0.90 1.645
0.92 1.75
0.95 1.96
0.96 2.05

## What is the 95 rule in statistics?

In statistics, the empirical rule states that 99.7% of data occurs within three standard deviations of the mean within a normal distribution. To this end, 68% of the observed data will occur within the first standard deviation, 95 % will take place in the second deviation, and 97.5% within the third standard deviation.

## What is the z-score for 99.9 confidence interval?

Step #5: Find the Z value for the selected confidence interval.

Confidence Interval Z
95% 1.960
99% 2.576
99.5% 2.807
99.9 % 3.291

## What is the z-score of 97%?

Percentile z – Score
95 1.645
96 1.751
97 1.881
98 2.054

## How do you find P value from Z-score?

The first way to find the p – value is to use the z -table. In the z -table, the left column will show values to the tenths place, while the top row will show values to the hundredths place. If we have a z -score of -1.304, we need to round this to the hundredths place, or -1.30.