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[solution]: Which of the following is used to measure the strength of the

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Approach to Quiz 2

1. Recall that the Binomial and Poisson tables list the cumulative probabilities. So, P(X?5)=1-P(X?4) and

the P(X?4) is given in the tables for k=4.

You may compute P(X=k) by using the equation for Binomial or Poisson or you may get the value of

P(X=N) from the tables, e.g. P(X=4) =P(X?4) ?P(X?3), where these values are obtained directly from the

tables.

2. In question #5 show all values used to compute the area (probability) using the Z table, e.g., P(-1<Z<2)

= P(0<Z<1)+P(0<Z<2) = .3413+.4772=.8185.

3. In question #6, list the values of each parameter n, Xbar, s, t(?/2) first, showing how t(?/2) was

determined. Then compute the CI for ?, the population mean.

4. In question #7, State Ho & Ha first. The test statistic is Z(test) that is computed from p?, po and n. The

critical value is found from the Z tables for the significance level = .01 for an upper, lower or two tail test

as determined from the sign of Ha. The p-value is found from the Z tables for the computed value of

Z(test). Compare the p-value with ? to determine if Ho is rejected, as consistent with comparing Z(test)

to Z (crit). Be clear and organized.

5. In question 8, compute the parameters Xbar, and s first. Compute the test statistic, Z(test) or t(test),

from Xbar, s n and ? and get the critical value, Z(crit) or t(crit), from the appropriate table for the given

value of ?. Compare the test value to the critical value and state the conclusion for rejecting Ho. DO

NOT COMPUTE P-VALUES FOR A ?t? TEST.

Good luck.

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