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## Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years. (Twenge, 2000). In the 1950s , the average score on the Child Manifest Anxiety Scale was μ= 15.1. A sample of n = 16 of today’s children produces a mean score of M = 23.3 with SS = 240. Based on the sample, has there been a significant increase in the average level of anxiety since the 1950s? Use a one-tail test with α= .05. n = df = M = μ = SS = s2 = sM b. State the hypotheses and select alpha c. Locate critical region for stated alpha d. Compute test statistic (t-score) Sample variance s²: Estimated standard error sₘ: Computed t statistic: e. Make a decision about the null hypothesis and state a conclusion.

Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years. (Twenge, 2000). In the 1950s , the average score on the Child Manifest Anxiety Scale was μ= 15.1. A sample of n = 16 of today’s children produces a mean score of M = 23.3 with SS = 240. Based on the sample, has there been a significant increase in the average level of anxiety since the 1950s? Use a one-tail test with α= .05.

n =

df =

M =

μ =

SS =

s2 =

sM

b. State the hypotheses and select alpha

c. Locate critical region for stated alpha

d. Compute test statistic (t-score)
Sample variance s²:
Estimated standard error sₘ:
Computed t statistic:

e. Make a decision about the null hypothesis and state a conclusion.

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