Form a 90 confidence interval for the mean life of a light

Assignment Help Basic Statistics

Reference no: EM13621852

1. Acme Corporation manufactures light bulbs. The CEO claims that an average Acme light bulb lasts 300 days. A researcher randomly selects 30 bulbs for testing. The sampled bulbs last an average of 310 days, with a standard deviation of 25 days.

a) How many degrees of freedom are there?

b) Using a t-distribution table, find the critical value t* for a 90% confidence interval.

c) Form a 90% confidence interval for the mean life of a light bulb made by Acme Corporation. (Round the answers to three decimal places.)

f) Find the test statistic (show work).

g) Find the P-value (show work).

Reference no: EM13621852

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