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For each of the following, (a) state which two populations are being compared, (b) state the research hypothesis, (c) state the null hypothesis, and (d) say whether you should use a one-tailed or two-tailed test and why.
i. In an experiment, people are told to solve a problem by focusing on the details. Is the speed of solving the problem different for people who get such instructions compared to the speed for people who are given no special instructions?
ii. Based on anthropological reports in which the status of women is scored on a 10-point scale, the mean and standard deviation across many cultures are known.Anew culture is found in which there is an unusual family arrangement. The status of women is also rated in this culture. Do cultures with the unusual family arrangement provide higher status to women than cultures in general?
iii. Do people who live in big cities develop more stress-related conditions than people in general?
Provide a plausible research question in the field of education that implies a bivariate correlation or regression. Identify your research question, your research (alternative) hypothesis, and your null hypothesis.
Women have been on a diet within the past 12 months. Using Normal approximation, what is the probability (±0.001) that 76% or more of the women in the sample have been on a diet?
What does it mean to say that a particular value of x has a z-score of -2.1?
Compute the mean, median, mode and standard deviation for the following discrete probability distribution.
In a classical experiment, Gregor Mendel observed the shape and color of peas that resulted certain crossbreedings. A sample of 556 peas was studied with the result that 315 produced round yellow,
What is the minimum sample size you should use to assure that your estimate of will be within the required margin of error around the population p?
The Wall Street Journal recently ran an article indicating differences in perception of sexual harrassment on the job between men and women.
Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead.
Speed 800 rpm counter-clock wise looking from right-side. Determine the precession velocity and direction of the system at vertical axis through the axis centre.
LINEAR PROGRAMMING MODELS
Finds the average life time for this sample is 970 hour and the standard deviation is 80 hours. Can the firm claim that the average life time is 1000 hours at the 5% level of significance?
Assume that x has a normal distribution, with the specified mean and standard deviation. Find the indicated probabilities.
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