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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?
Calculate the measures of central tendency, dispersion, skew for your data. Display your descriptive statistical data using graphic and tabular techniques. Frequency distribution, Histogram.
Suppose x follows a distribution with density function: f(x)=C*abs(x-2), 0 =
Recognize and describe potential threats (up to 3) to internal validity.
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
Primary healthcare workers believe that anaphylactic shock reaction to immunization injections occurs with children in one case in two thousand.
The mean time between reoccurring events is exponentially distributed with a mean time between events of 15 minutes.
Possible test scores could range from 0 to 500. Assume that the scores are normally distributed. Find the probability that a student had a score higher than 320.
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
What is meant by the probability of an event? Discuss how addition and multiplication techniques are used to solve probability problems.
The condition for the question is that the deck of cards has 52 cards and among them are 12 face cards. What is the probability of choosing 6 face cards out of 8 chosen. Thru Binomial distribution holds( meaning with replacement)
Assume that the following four examines were tested as part of a large group that had a normally curved distribution.
Do you think this detection bias would strengthen or attenuate the association between vegetarian diet and learning disabilities? Defend your choice briefly.
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