What is the probability of a z- score falling within one standard deviation of t

Question

What is the probability of a z-score falling within one standard deviation of the mean in a normal distribution?

In an ANOVA study on the impact that various forms of cellphone use have on driving speed, a researcher concludes that there are no systematic treatment effects. What was the F-ratio closest to?

An analysis of variance is used to evaluate the mean differences for a research study comparing three treatment conditions and the same number of scores in each sample. If SSbetween treaments = 24 and SSwithin = 72, and F = 4, how many scores are in each sample?

Which of the following situations is an example of a dichotomous variable and would therefore suggest the possible use of a point-biserial correlation.

In a two-factor, independent-measures ANOVA, a researcher found the following values:

MS within treatments = 3

MS A = 12.32

MSB = 11.14

MSA ×B = 29.76

Find the three F-ratios.

a. 34.13% b. 65.87% c. 68.26% d. 95.44% 14

Explanation / Answer

1) Probability of being within one standard deviation from the mean is found from normal tables.

Probability =1-[P(Z>1)+P(z<-1)] = 1- 2*0.158655 = 0.68269

Hence, C is the correct answer.

Please repost the other questions individually.

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