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Question: School psychologist wants to test the effectiveness of a new method for teaching reading. She recruits 500 first-grade students in District 203 and randomly divides them into two groups. Group 1 is taught by means of the new method while Group 2 is taught by traditional methods. The same teacher is assigned to teach both groups. At the end of the year, an achievement test is administered and the two groups are compared.
a. Is this an experiment or an observation?
b. If it's an experiment, what is the response variable? If it's an observation, what are they observing?
c. Think of some of the factors in the study. How are they controlled?
d. How are the factors that are not controlled dealt with?
e. Which group serves as the control group?
f. Identify the subjects.
Fixed costs of $9,200 per month and variable costs of 70 cents per unit produced. Each item is sold to retailers at a price that averages 90 cents.
Obtain a test statistic and p-value assuming equal variances. Interpret these results.
Quadratic equations can be solved by graphing, using the quadratic formula, completing the square, and factoring. What are the pros and cons of each of these methods?
Pretests, posttests and threats to internal validity and please discuss all threats to internal validity.
A marble is selected at random from a jar containing 6 red marbles, 5 yellow marbles, and 4 green marbles. What is the probability that the marble is red
If the distribution of movie admission charges is approximately normal with a standard deviation of $ 0.89 . What is the probability that a randomly selected admission charge is between 6 and 8.2 dollars?
a pysics lab instructor wants to estimate the time required for physic students to complete a required experiment. from
Find a 95% confidence interval for the percentage of girls and women in Taiwan who had antibodies at that time.
Please give an example on higher wages vs. education level using a sample population of 30 men and women. Compute the measures of central tendency, dispersion, and skew for your data
Does the regression equation account for a significant portion of the variance in GPA? Use ∝ = .05 to evaluate the F - ratio.
Two companies, a and b, drill wells in a rural area. Company A charges a flat fee of $3500 to drill a well regardless of its depth. Company B charges $1000 plus $12 per foot to drill a well. the depths of wells drilled in this area have a normal dist..
If sales is the variable you are trying to explain and you have 2 independent variables of color and price. The color coefficient is 100, and the price coefficient is -200.
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