Z test

1.A school has implemented a new program to increase SAT scores.He knows the population mean for SAT scores is 1200 and standard deviation = 120.The school hypothesizes that their students in the program will score significantly above the national mean.The schools 10 students' scored a mean of 1320.

Step 1. Identify the given information.

=s_x=X =n =

Step 2. State your hypotheses.

a.Is it a one-tailed or two-tailed test?one-tailed

b.Research:

c.Statistical:

Step 3. Set the significance level.a= .05.

Step 4. Do the statistics.

a.Compute the test statistic.

b.Determine whether the value of the test statistic is in the critical region. Draw a picture.

Step 5. Draw conclusions.Explain in plain language what this means.