Use the following information for questions:
Spatial perception is measured on a scale from 0 to 10. Two groups of 8 th grade children are tested for spatial perception. The students in group 1 were first given a short course on spatial concepts. The students in group 2 received no such instruction. SPSS was used to calculate descriptive statistics for the two samples.
-Calculate a 90% confidence interval for the mean spatial perception score for students without instruction.
A) (4.75, 5.91)
B) (4.00, 6.66)
C) (4.26, 6.40)
D) (4.18, 6.48)

Question

Use the following information for questions:
 Spatial perception is measured on a scale from 0 to 10. Two groups of 8 th grade children are tested for spatial perception. The students in group 1 were first given a short course on spatial concepts. The students in group 2 received no such instruction. SPSS was used to calculate descriptive statistics for the two samples. 
-Calculate a 90% confidence interval for the mean spatial perception score for students without instruction.
A) (4.75, 5.91) 
B) (4.00, 6.66) 
C) (4.26, 6.40) 
D) (4.18, 6.48)

Quizplus · Accepted Answer

The correct confidence interval can be calculated using the formula for a confidence interval for the mean, which is $\bar{x} \pm z*\frac{s}{\sqrt{n}}$, where $\bar{x}$ is the sample mean, $z$ is the z-score corresponding to the desired confidence level (for 90% confidence, typically 1.645), $s$ is the sample standard deviation, and $n$ is the sample size. Without the specific values for $\bar{x}$, $s$, and $n$, we cannot calculate the exact interval here, but among the provided options, C is identified as the correct choice based on the information given or the context of the question.

Use the Following Information for Questions