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What is the minimum number of employees that should be sampled by a corporation if it wishes to estimate the true difference in the means of the number of years to retirement of its men and women employees to within one month of the true difference and with 95% confidence if the range of all the data is 6 years? Use the appropriate tables in your book.
A survey of 200 recent graduates from your school revealed that 80 students had jobs. At the .02 significance level, can we conclude that a larger proportion of students at your school have jobs?
Construct a 95% confidence interval for the true proportion of the market who still refuse to visit any of the restaurants in the chain three months after the event.
A person asks, "what do you think is the ideal number of children for a family to have?" The 497 females who responded had a median of 2, mean of 3.02, and a standard deviation of 1.81.
Identify your research question, your research (alternative) hypothesis, and your null hypothesis. Also, identify your independent and dependent variable.
A psychologist is examining the influence of an older sibling in the development of social skills. A sample of 24 three year old children is obtained.
Would Kruskal-Wallis be the suitable statistical procedure to test this Research Question (RQ)? Describe your answer. When would you use Chi-Square test rather than One-Way Anova?
A chemical process converts lead to gold. However, the production varies due to the powers of the alchemist. It is known that the process is normally distributed, with a standard deviation of 2.5 g. How many samples must be taken to be 90% certain..
Describe the data for a correlational research study. Explain how correlational research is different from other research evaluating the relationship between two variables.
Provided that the selected student excels in sports, determine the probability that the student is a boy?
If the gender-selection method has no effect and boys and girls are equally likely, find the mean number of boys born in groups of 152. Round to the nearest whole number.
Can you cite published examples for one or more countries or regions? Can you think of other cases where the expected probabilities do not quite agree with the empirical values based on relative frequency?
What can you tell me about the direction, strength and significance of this association and What would you expect for somebody without any formal education whatsoever and what can you tell me about the nature of this relationship?
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