PLease Answer all!!!

Which of the following is an appropriate null hypothesis for a t-test?

H₀:= 0

H₀: _{1 2 3}

H₀: ₁= ₂

H₀: ₁< ₂

H₀: ₁= ₂= ₃

Which statistical test would you use to determine if there is a significant difference between a sample mean and a population mean?

One sample Z test

Correlation test

Independent t-Test

ANOVA

Dependent t-Test

For which of the following test statistics do you NOT use degrees of freedom when determining critical value?

r

t

z

F

The independent t-test differs from the paired t-test in terms of:

Research hypotheses; for paired t-tests they must be non-directional

Level of significance

How the critical value is determined

How the t-statistic and degrees of freedom are defined

Skewness of the t-distribution

The coefficient of determination, r², represents:

Content validity

Direction and strength of a correlation

The proportion of total variation explained by a linear correlation

Probability that the data resulted by random chance

The amount that data deviate from the mean value

In the Normal distribution, 95% of the values lie in the range of -1.96 < z < 1.96. What is the probability of measuring something randomly selected from a population that is normally distributed and getting a z-score greater than 1.96?

2.5%

5%

95%

97.5%

100%