Other files provided with this exam: 1. Equations.pdf 2. Tables.pdf Questions in the final may refer to these other files. Instead of using the z-table in reverse to get a z-value from an area, here is a quick- reference table for the most commonly used values: if a = Area in One Tail a (1-tailed) 0.005 0.01 0.025 0.05 0.10 if a = Area in Two Tails a(2-tailed) 0.01 0.02 0.05 0.10 0.20 c = Confidence Level C 99% 98% 95% 90% 80% Zc = Critical Z-Value (negative if left-tailed, +- if two-tailed), Za/2 for confidence interval Zc/ Za/2 2.576 2.326 1.960 1.645 1.282 When complete, scan to a single PDF file and submit on D2L. Be sure to read the instructions carefully before answering a question. Every small detail asked for in the question must be provided. If a problem asks you to solve a problem in a certain way, it must be solved in that way. If stuck on a question, look through the equation sheet for ideas (although most of the problems can be solved with technology, this might help you think about what type of problem it is). Also look through old worksheets for similar problems. You can simply reject or fail to reject Ho. However, for a final conclusion to a hypothesis test, it must be of the form: At the _ level of significance, there (is) /(is not) sufficient evidence to (reject)/(support) the claim that . (and then write out the entire claim in words, not symbols, do not just say "the claim").5. IQ and Lead Exposure: A study looked at the relationship between blood lead-levels and 1Q. The IQ scores were measured for a group with low blood lead levels, and the IQ scores were measured for a group with high blood lead levels. The result are as follows, where x is the average IQ score for each group: Low Blood Lead Level: n = 78, x =92.88462, s=15.34451 High Blood Lead Level: n = 21, x =86.90476, s = 8.988352 The population standard deviations are unknown and not assumed to be the same. Us a 0.05 significance level to test the claim that the mean IQ score of people with low blood levels is higher than the mean IQ score of people with high blood lead levels. Ho: / = #2 HI: M > #2 (claim) (x, - $2 ) -(4 -4), d.f. is the smaller of n, -1 or n, -1 a. State the value of a and whether this is a left-tailed, right-tailed, or two-tailed test. a = left-tailed, right-tailed, or two-tailed? b. State the value of all the variables in the test statistic equation above and the degrees of freedom (d.f.). Hint: remember that for the purpose of this calculation, you can set 4 - 42 =0 n = X = M - 12 = n, X = S, = d.f. = c. Using technology, find the value of the test statistic t and well as the value of P. [ final answer]: t = [ final answer]: P = d. Compare the values of a and P (show the comparison) and determine if you reject or fail to reject the null hypothesis. e. What is your conclusion about the original claim? IT MUST BE WRITTEN IN EXACTLY THE FORM SPECIFIED ON THE FIRST PAGE OF THIS DOCUMENT