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A scale of optimism is scored so that μ = 100. A randomly selected group of 60 students is given a lecture on 'looking at the world through half-filled glasses' and then takes the optimism scale.
State: (i) the null hypothesis and
(ii) whether you would use the single-sample z test or the single-sample t test to analyze the data.
Explain the basis for your selection of a statistical test.
in a recent survey of 205 never-married single women 78 thought they would eventually find and marry their perfect
assuming that both population s are normally distributed construct a 95 confidence interval about micro1 - micro2 .
Independent random samples of sizes nX = 8 and nY = 10 were extracted from normal populations having unknown means. What is the 95% confidence interval for µX - µY if the population variances are unknown?
It is believed that the effects of smoking differ depending on race. The following table gives the results of a statistical study for this question.
For a t-distribution with ten degrees of freedom, find (t-sub-alpha) for alpha value of 0.05 (this is the value such that the right tail probability is 0.05
Compare the observed number of runs with the expected number, then interpret what this difference might mean in terms of the sequence of the appointees. At the 0.10 level of significance, test the randomness of this series.
The following bar graph shows the distribution of favorite subject for a sample of 1000 students. What is the most serious problem with the graph?
Approximate the probability that the salt on hand will suffice for the next 50 days - what assumption did you make in solving part (a)?
a converging lens f 12.8 cm is located 30.3 cm to the left of a diverging lens f -5.4 cm. a postage stamp is placed
What is the probability an individual large-cap domestic stock fund had a three-year return of at least 10%?
The national average SAT score (for Verbal and Math) is 1028. Suppose that nothing is known about the shape of the distribution and that the standard deviation is 100. If a random sample of 200 scores were selected and the sample mean were calcula..
Determine if the response to the survey question was independent of the year in which the question was asked. Use a significance level of 0.05.
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