Determine the point estimate of the population mean, and construct a 95% confidence interval estimate of the population mean.

Use a 0.10 significance level to test the claim that the population mean of all such employees weighs less than 200 lbs.

1) The health of employees is monitored by periodically weighing them in. A sample of 54 employees has a mean weight of 183.9 lbs. Assuming that ? is known to be 121.2 lbs.

This is what I have come up with so far. I believe the answers are the ones in red. Is this right?

//////////// SL

///////////// a ////////Z

Ho=.5///// .10/////// 1.645///// -1.645

Ha/=.5 /// .05////// 1.96////// -1.96

xxxxxxx///// .01////// 2.75////// -2.75

Ho?.5///// .10//////-1.28

Ha<.5///// .05//////-1.645

xxxxxxx///// .01//////-2.33

Ho?.5/////// .10/////

**1.28**

Ha>.5 /////// .05/////1.645

xxxxxx//////// .01///// 2.3 :?: