A researcher is investigating the effectiveness of a new

Reference no: EM13610313

A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n=25 third-grade children is selected to participate in the program and each child is given a standardized achievement test at the end of the year. For the regular population of third-grade children, scores on the test form a normal distribution with a mean of u=150 and a standard deviation of o=25. The mean for the sample is M=158.

a. Identify the independent and the dependent variables for this study.

b. Assuming the two-tailed test, state the null hypothesis in a sentence that includes the independent variable and the dependent variable.

c. Using symbols, state the hypotheses (Ho & H1) for the two-tailed test.

d. Sketch the appropriate distribution, and locate the critical region for alpha = .05. (state the critical region, but you don't have to post the sketch unless you know how to input a graph)

e. Calculate the test statistic (z-score) for the sample. Show all steps, formulas, and plug in the numbers.

Reference no: EM13610313

Questions Cloud

Knowing the coefficient of restitution between a and b is : a 2-kg ball b is traveling horizontally at 3 ms when it strikes 2-kg ball a. ball a is initially at rest and is

Maturity risk premium an investor in treasury securities : maturity risk premium. an investor in treasury securities expects inflation to be 2.5 in year 1 3.2 in year 2 and 3.6

90 fpm for 30 min 80 fpm for 90 min 75 fpm for 150 min a : if a bar of sae 1040 is to be turned with a high speed steel tool with a feed of 0.015 per revolution and a depth of

Expectations theory one-year treasury securities yield 5 : expectations theory. one-year treasury securities yield 5. the market anticipates that 1 year from now 1 year treasury

A researcher is investigating the effectiveness of a new : a researcher is investigating the effectiveness of a new study-skills training program for elementary school children.

A free electron and a free proton are exactly 13 cm apart a : a free electron and a free proton are exactly 1.3 cm apart.a find the magnitude of the acceleration of the proton.

Maturity risk premium the real risk-free rate is 3 and : maturity risk premium. the real risk-free rate is 3 and inflation is expected to be 3 for the next 2 years. a 2-year

We want to recover 993 of the propanol in the distillate : a distillation column with a total condenser and a partial reboiler is separating two feeds. the first feed is a

What is the fraction recovery of the enzyme and the amount : suppose that 100 lmin are drawn from a fermentation tank and passed through an extraction tank in which the

User Account

All Pages