Problem 2E

In a sample of 20 bolts, the average breaking torque was 89.7 J with a standard deviation of 8.2 J. Assume that the breaking torques are normally distributed.

a. Find a 99% prediction interval for the breaking torque of a single boll.

b. Find a tolerance interval for the breaking torque that includes 95% of the bolts with 99% confidence.

PSYCH STATS POWERPOINT CHAPTER ONE ● 3 types of stats ○ values ■ batting averages, crime rates, etc. ○ procedures ○ field of study ■ using and applying stats to answer questions ● statistics are the tools we use to learn about various phenomenon ● 3 main functions: ○ organize ○ summarize ○ and interpret information ● organize ○ collect and examine all info ■ graphs ■ tables ○ no actual manipulations or calculations ○ data is still in raw form ■ most basic thing you could do with data ● summarize ○ represent all info ○ reduce all info to single values ■ descr