What is the Z-score for a confidence interval?

[RandalRodd]

Hi everyone,
Can someone explain how to find the Z-score for a given confidence interval? A simple explanation would be really helpful. Thanks!

 

[shanewarne]

A Z-score for a confidence interval represents how many standard deviations a value is from the mean and determines the interval’s width. Common Z-scores:

• 90% confidence: 1.645
• 95% confidence: 1.96
• 99% confidence: 2.576
  
  It’s used in the formula: mean ± Z × (σ/√n).

 

[peterkavinsky]

The Z-score for a confidence interval is a value from the standard normal distribution that corresponds to the desired confidence level, used to calculate the margin of error for estimating a population parameter.

 

[Lucky]

A Z-score represents how many standard deviations a value is from the mean and is used to calculate confidence intervals. Common Z-scores include 1.96 for 95% confidence, 1.64 for 90%, and 2.58 for 99%. These values help determine the margin of error and the probability range for population estimates.

 

[Clara]

The Z-score for a confidence interval is the critical value from the standard normal distribution that corresponds to your confidence level, commonly 1.96 for 95%, 1.645 for 90%, and 2.576 for 99%.

 

[Amparo]

The crucial value from the standard normal distribution that corresponds to your confidence level is known as the Z-score for a confidence interval; it is typically 1.96 for 95%, 1.645 for 90%, and 2.576 for 99%.

 

[George]

The Z-score for a confidence interval is the standard value that corresponds to the desired confidence level (e.g., 1.96 for 95% confidence, 1.645 for 90%, 2.576 for 99%).

 

[Charles]

The Z-score for a confidence interval is a value taken from the standard normal distribution that corresponds to a chosen confidence level. Common Z-scores are 1.645 for 90%, 1.96 for 95%, and 2.576 for 99% confidence intervals.

 

[robbin]

A Z-score for a confidence interval is a critical value from the standard normal distribution that corresponds to the desired confidence level. Common Z-scores are 1.645 for 90%, 1.96 for 95%, and 2.576 for 99% confidence intervals.

 

[simran]

The Z-score for a confidence interval is the number of standard deviations a data point is from the mean, used to determine the margin of error for the interval. For example:

• 90% CI → Z ≈ 1.645
• 95% CI → Z ≈ 1.96
• 99% CI → Z ≈ 2.576

 

[Luca]

A Z-score for a confidence interval is the number of standard deviations a value lies from the mean, used to determine the margin of error for a given confidence level.

For example:

• 90% → Z ≈ 1.645
• 95% → Z ≈ 1.96
• 99% → Z ≈ 2.576

It tells you how far from the mean the interval extends in a standard normal distribution.