Page 80 - Basic Statistics

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EXERCISES 4

1. A survey of 210 households in the district of kutai kartanegara noted that

the average monthly of household income is 1.2 million with a standard

deviation of 0.12 million. The same survey conducted on 210 households in

the district of kutai timur, noting that the average monthly of household
income is 0.97 million with a standard deviation of 0.13 million. Test the

hypothesis with a significance level of 5 percent that:

a. Average of household income of kutai timur lower than kutai

kartanegara.

b. The Average household income are no different between the two
districts.

2. A bulb plant produces two types of bulb, and claimed that the second type

of bulb is better than the first type. From a drawn random sample of size 24

in both types of bulb, noting the average and standard deviation over the

long lit bulb (hours), which bulb type I: X = 5,800 hours s = 31 hours, and
1
type II: X = 6,000 hours, s = 30 hours. Test the hypothesis with a
2
significance level of 1 percent that;

a. The average of the lights up both type is equal.

b. Second type longer than first type.
3. Data on the test scores of the expository and the cooperative learning

models successively recorded in columns 2 and 3 of Table 4.3. Test the

hypothesis that the two models of learning (a) did not differ, (b) the

cooperative model is better than the direct model.

~~* CHAPTER 4 TESTING HYPOTHESIS *~~