Calculate the test that should be used to best this claim. 2.33 0.345 -2.33 3.45

Question

Calculate the test that should be used to best this claim. 2.33 0.345 -2.33 3.45 Observational study or designed experiment? Choose the correct statement about the scenarios 1 and 2. A stock analyst compares the relationship between stock prices and earnings per share to help him select a stock for investment. A teacher in one randomly selected classroom gives a standard lesson without the use of manipulatives. A teacher in the second randomly selected classroom gives a geometry lesson that incorporates the use of math manipulatives. The same three-question quiz is given and the scores of the two classrooms are compared to see whether the use of math manipulatives improved quiz scores. 1 is a designed experiment, 2 is an observational study 1 is an observational study, 2 is an observational study 1 is a designed experiment, 2 is a designed experiment 1 is an observational study, 2 is a designed experiment

Explanation / Answer

1) values are not clear so unable to answer . U send a clear image

2 )

mean =1850 , s = 320 , n =20

t value = 1.729

CI = mean + t * (s / sqrt(n))

= 1850 + 1.729 * ( 320 / sqrt(20))

= 1973.72 = 1974

3)

z = ( x - mean) / (s / sqrt(n))

= ( 980 - 910) / ( 120/ sqrt(35))

= 3.45

Answer is option D)

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