Day31, Math151

Math 151 , Day 31, Monday, April 16, 2001

Questions on confidence interval HW
Same Quiz again as Day 29

Significance testing:

* Take a sample of size 4 from each shoebox (Jumping Jacks "JJ", and Sperry Topsider "ST").
Record each set of 4 on your paper. Find the mean (xbar) of each set. The population standard dev. is 4.
H₀: "population mean = 20", and H_a: "population mean > 20".
For HW , for each mean find: the standardized z for your mean, given that H₀ is true (the true mean is 20).
and the p-value for each mean.
Bring to class to record with others. (return samples to the correct shoebox, please!)

Notes Day 30
HW: Continue to Reread Sec. 6.2. Focus on pp. 318-334 for next time. When that's under control, continue.
Sec. 6.2: (text problems same as bottom of Day 30) Hand in Wednesday

Hand in:
Sketching x-bars for H₀, p-value
p. 323, 6.25 SSHA
6.26 Spending on housing

Stating null and alternative hypotheses
p. 325 6.27, 28, 29, 30

Calculating p-value (one-sided), relating to Sig. level
p. 328, 6.31 and 32 (extending 6.25 and 26)
6.33 restating jargon

Calculating p-value (one or two-sided), using z test statistic, relating to Sig. level
p. 333, 6.34 price reduc. on coffee
6.35 crankshafts true? Use your calculator to find the sample mean.
6.36 cola? Use your calculator to find the sample mean.

* The means, z's, P-values for your two samples from the shoebox, as described above.

Read, to discuss

Optional
(more practice)
Stating null and alternative hypotheses
p.340, 6.41,42

Calculating p-value (one or two-sided), using z test statistic, relating to Sig. level
p. 340 6.43 watered milk?

Sievers home

Math151-Sp01/Day31.htm

11pm

4/15/01

This page belongs to Sally Sievers who is solely responsible for its content. Please see our statement of responsibility.