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Is reaction time to a red light different from that to a green light? Suppose 20 subjects have been selected at random and given a preliminary test to determine the reaction time of each individual to a white light stimulus. From among this group, 10 pairs of subjects are formed such that the two members of any given pair are equal or nearly equal in speed of reaction to white light. Taking each pair in turn, one member is first tested with a green light as the stimulus and the other with a red light. Which member of each pair receives which stimulus first is determined at random. Reaction times are recorded in milliseconds. The results are given in Data 15A.
(a) State formally the null and alternative hypotheses necessary to conduct a non directional test.
(b) Complete the test at the .05 level of significance, and state your conclusion.
(c) Does it matter which group was designated as X and which as Y?
(d) Calculate effect size, g.
Teen smoking II. Suppose that, as reported by the Centers for Disease Control, about 30% of high school students smoke tobacco.
Consumer Reports published an article on some sport-utility vehicles they had tested recently. They reported some basic information about each of the vehicles and the results of some tests conducted by their staff.
What is the difference between a point estimate and an interval estimate? How would you calculate a confidence interval with a z test?
A sample of 50 bottles reveals a mean weight of 502.1 ml. Construct and interpret a 90% confidence interval for the mean. Be sure to interpret the meaning of this interval.
random variable x denotes the number of daughters in a family of 2 children. the probability of having one daughter is
Construct a 90% confidence interval for the above data Be sure to interpret this confidence interval in the context of this setting. State the null and alternative hypotheses in words and symbols. Compute the test statistic
suppose that john and david are shooting at a target. the probability that john hits the target is 17 and the
Sample standard deviation s=4.8. what is a point estimate off the difference between mean annual consumption in Webster City and the national mean?
Using laplace transforms solve the following problems: 1. Find Y(t) if Y'''' + 2Y'' +Y = 3 + cos 2t with Y(0) = Y'(0) = Y''(0) = Y'''(0) please show the partial fraction expansion and how it was obtained..do not need to invert.
a) What is the distribution and parameter(s) for N and for S?
Comparing the means of two populations is useful in some instances. What other information and why is needed to ensure the comparison is valid statistically?
Construct a 95% confidence interval estimate of the mean CD4 cell count and how many subjects would be required to estimate the mean CD4 cell count within 15 cells of the true value with 95% confidence?
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