Question: please can someone explain how to use the t table for confidence intervals? I cant figure it out at all. Example:A stationery store wants to

please can someone explain how to use the t table for confidence intervals?

I cant figure it out at all.

Example:A stationery store wants to estimate the mean retail value of greeting cards that it has in its inventory. A random sample of 100 greeting cards indicates a mean value of R2.65 and a standard deviation of R0.44. Assuming a normal distribution, construct a 95% confidence interval estimate of the mean value of all greeting cards in the stores inventory.

2.65 1.9842 0.44/100 2.65 0.0873 2.65 0.0873, 2.65 + 0.0873 (2.5627 , 2.7373)

Please can you explain how they got the t Value of1.9842 from a df=99 and 95%confidence interval

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