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Lesson #12 Assignment1. For the following studies, state whether estimation or hypothesis testing is required. Also,is an independent- or a repeated-measures t statistic appropriate?a. An educator wants to determine how much mean difference can be expected for the population in SAT scores following an intensive review course. Two samples are selected. The first group takes the review course, and the second receives no treatment. SAT scores are subsequently measured for both groups.b. A psychiatrist would like to determine whether a new medication has any effect on psychotic symptoms. A sample of patients is assessed and then placed on drug therapy for 2 weeks. The severity of their symptoms is assessed again at the end of the treatment.c. A researcher would like to determine how much people's moods are affected by seasonal changes. A sample of 100 adults is obtained and each individual is given a mood-analysis questionnaire in the summer and again in the winter.d. A researcher would like to determine whether participation in sports has an effect on self-esteem for high school students. The researcher obtains a sample of 50 students who are active in varsity sports and a comparison sample of 50 students who do not participate in any high school sports. Each student is given a self-esteem questionnaire.2. A sample of n = 16 scores is obtained from an unknown population. The sample has a mean of M = 46 with SS = 6000.a. Use the sample data to make an 80% confidence interval estimate of the unknown population mean.b. Make a 90% confidence interval estimate of μ.c. Make a 95% confidence interval estimate of μ.d. In general, how is the width of a confidence interval related to the percentage of confidence?
Use the analysis of variance (α = 0.05) to find out whether this data is sufficient to conclude that there are significant differences between feedback conditions.
They want you to determine what the data indicate about this.In this problem I am having an issue trying to determine what equation to use to solve. Is this a one or two way ANOVA or should I just use a z-test to solve?
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
Find the probability that both light bulbs failed the test. Find the probability that both light bulbs passed the test. find the probability that at least one light bulb failed the test.
Employees of a local company are classified according to gender and job type. The following table summarizes the number of people in each job category.
If the manufacturer sells the parts in packages of 10 parts, what are the mean and standard deviation of the number of useable parts in a package?
If the computer manufacturer decides to sample 2,300 of the microchips received in each shipment, what acceptance number, c, would they want?
A business invests $10,000.00 in a savings account for 2 years, At the beginning of the second year, an additional $3500.00 is invested, At the end of the second year, the account balance is $15,569.75. What is the annual interest rate?
To model this fact, we assume that only half of the goods produced during a week can be used to meet the current week's demand (assume that all of the prior week's ending inventory can be used to meet the current week's demand). Determine how to m..
A national Retail Foundation survey found housholds intended to spend an average of $932 during the December holiday season. Assume that the survey included 850 households and that the standard deviation of the sample is $215.
For the first test, assume the data are from an independent-measures study using two separate samples.
Critically illustrate out the term standard deviation. Define mathematical averages. Why is the standard deviation less than the mathematical average?
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