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Rev 3123 T 2 -sum

# Rev 3123 T 2 -sum - REVIEW Test 2 STA 3123 I A researcher...

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REVIEW Test 2 STA - 3123 I. A researcher wants to determine whether the primary language spoken at home affects a child's reading level at the end of first grade. She randomly selected 10 children from English speaking homes, 10 from Spanish speaking homes and 10 from Creole speaking homes. At the end of the first grade the children are given a reading achievement test. Do the data provide sufficient evidence to indicate that the mean reading scores differ for at least two of the three language groups? Identify what experimental design was used. a. Independent samples z-test b. Independent samples t-test c. A randomized block design d. A completely randomized design ANOVA e. Matched pairs t-test II. Three methods of treating beer cans are being compared by a panel of 5 people. Each person samples beer from each type of can in random order and scores the beer with a number (integer) between 0 and 6, 6 indicating a strong metallic taste and 0 meaning no metallic taste. Do the data provide sufficient evidence to indicate that the mean scores differ for at least two of the three beer cans? a. Independent samples z-test b. Independent samples t-test c. A randomized block design d. A completely randomized design ANOVA e. Matched pairs t-test III. Complete the ANOVA summary table: SOURCE df SS MS F Treatments 5 67.23 Error 23 Total 274.94 1) ____________ subjects were used for this experiment. 2) There are ________ treatment levels. 3) The estimate of the common variance is ____________. 4) If α = .10 , RR: _______________________________. IV. The lateral drift of a newly constructed skyscraper can be estimated with sophisticated computer software. The goal is to compare the mean drift estimates made by three different computer programs (A, B or C). Recognizing that lateral drift will depend on building level (floor), the drift (in inches) at each of five levels (Floors 1, 30, 70, 120, and 200) was estimated in random order by each of the three programs. Identify what experimental design was used. a) The Response is: b) The Factor(s) and factor level(s) is (are): c) The treatment(s) is (are): d) The Experimental units are: V. A randomized block design used 5 blocks to compare the means of 4 treatments. Complete the ANOVA summary table for this experiment. Use α = .05.

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SOURCE df SS MS F Rejection Region Reject H o ? Treatment 32 F > Block 28 F > Error 1.6 TOTAL VI. Science reported on the ability of 7-month-old infants to learn an unfamiliar language. In one experiment, 16 infants were trained in artificial language. Then, each infant was presented with two 3-word sentences that consisted entirely of new words. One sentence was consistent and one sentence was inconsistent (constructed from grammar in which the infant was not trained). The time, that infant spent listening to the speaker, was measured in each trial, with the goal to compare the mean listening times of consistent and inconsistent sentences.
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