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Inga [223]
3 years ago
14

A 9-year-old who responded to the original Stanford-Binet with the proficiency of an average 12-year-old was said to have an IQ

of:_______.
a. 75.
b. 115.
c. 125.
d. 133.
Social Studies
1 answer:
aivan3 [116]3 years ago
8 0

Answer:

d. 133

Explanation:

IQ = (mental age/chronological age) x 100

= (12/9) x 100

= 133

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A survey asked 26 adults how many years of education they had. The sample mean was 13.03 with a standard deviation of 3.22. It i
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Let x be a random variable that represent the number of years of education.

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Critical t-value for \alpha=0.1 and df = 25 will be

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\overline{x}\pm t_{\alpha/2,df}\dfrac{s}{\sqrt{n}}\\\\=13.03\pm (1.7081)\dfrac{3.22}{\sqrt{26}}\\\\=13.03\pm  (1.7081)\dfrac{3.22}{5.09902}\\\\=13.03\pm 1.08\\\\=(13.03-1.08,\ 13.03+1.08)\\\\ =(11.95,\ 14.11)

A 90% confidence interval for the mean number of years of education = (11.95, 14.11)

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