## What is the T score for 98 confidence interval?

The T-distribution

Confidence Level | 80% | 98% |
---|---|---|

Degrees of Freedom (df) | ||

1 | 3.078 | 31.82 |

2 | 1.886 | 6.965 |

3 | 1.638 | 4.541 |

**How do you find the value of ZA 2?**

If you have a question asking you to find z alpha/2, you’re being asked to find an alpha level’s z-score for a two tailed test. Alpha levels are related to confidence levels: to find alpha, just subtract the confidence interval from 100%. for example, the alpha level for a 90% confidence level is 100% – 90% = 10%.

**What is the critical value for 98%?**

Thus Zα/2 = 1.645 for 90% confidence. 2) Use the t-Distribution table (Table A-3, p. 726). Example: Find Zα/2 for 98% confidence….

Confidence (1–α) g 100% | Significance α | Critical Value Zα/2 |
---|---|---|

90% | 0.10 | 1.645 |

95% | 0.05 | 1.960 |

98% | 0.02 | 2.326 |

99% | 0.01 | 2.576 |

### What is 98 confidence level?

z – score for 98% confidence interval is 2.33.

**What is the critical value za 2?**

Confidence (1–α) g 100% | Significance α | Critical Value Zα/2 |
---|---|---|

90% | 0.10 | 1.645 |

95% | 0.05 | 1.960 |

98% | 0.02 | 2.326 |

99% | 0.01 | 2.576 |

**How to find Z Zα / 2 ( Za / 2 )?**

We can also use a Critical Z Value Calculator to find zα/2 for some test. For example, for some test that is using a 90% confidence level we can simply enter 0.1 as the significance level and the calculator will automatically return the value of 1.645 as the corresponding critical z value:

## How to find Zα / 2 for 98% confidence?

Example: Find Zα/2for 98% confidence. 98% written as a decimal is 0.98. 1 – 0.98 = 0.02 = a and α/2 = 0.01. Find 0.01 in the “df” row at the top of page A12. Zα/2is the very last entry in the column under 0.01. Hence Zα/2= 2.326 for 98% confidence. 3) Use the TI 83/84 Calculator. Example:Find Zα/2for 99% confidence.

**How to find your Z Alpha / 2 level?**

Subtract your confidence level from 100%. For example, if you have a 95 percent confidence level, then 100% – 95% = 5%. .50/2 = 2.5 percent. Step 4: Convert Step 3 to a decimal and find that area in the center of the z-table. The closest z-score to 47.5 percent (.475) is at z=1.96.

**What is the Z critical value of Zα / 2?**

The corresponding z critical values on the outside of the table are -1.64 and -1.65. By splitting the difference, we see that the z critical value would be -1.645. And typically when we use zα/2 we take the absolute value. Thus, z.01/2 = 1.645.