A study was conducted to test effect of new ecofriendly alternative to road salt on automobile traction. A random sample of skidding distance (in meters) of cars along the same stretch of highway throughout a cold, icy winter day was obtained. The data are given in following table.
|
488
|
352
|
455
|
199
|
288
|
406
|
575
|
435
|
545
|
385
|
|
299
|
433
|
183
|
260
|
273
|
402
|
310
|
313
|
143
|
424
|
Assume the distribution of skidding distances is normal. Find a 95% confidence interval for the true mean skidding distance.