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Visual search study. When searching for an item (e.g., a roadside traffic sign, a lost earring, or a tumor in a mammogram), common sense dictates that you will not reexamine items previously rejected. However, researchers at Harvard Medical School found that a visual search has no memory (Nature, August 6, 1998). In their experiment, nine subjects searched for the letter ‘‘T'' mixed among several letters ‘‘L.'' Each subject conducted the search under two conditions: random and static. In the random condition, the location of the letters were changed every 111 milliseconds; in the static condition, the location of the letters remained unchanged. In each trial, the reaction time (i.e., the amount of time it took the subject to locate the target letter) was recorded in milliseconds.
(a) One goal of the research is to compare the mean reaction times of subjects in the two experimental conditions. Explain why the data should be analyzed as a paired-difference experiment.
(b) If a visual search has no memory, then the main reaction times in the two conditions will not differ. Specify H0 and Ha for testing the ‘‘no memory'' theory.
(c) The test statistic was calculated as t = 1.52 with p-value = .15. Make the appropriate conclusion.
Null Hypothesis (Ho): There is no significant difference between the population average scores of mathematics among these three groups with different teaching method.
consider the following bivariate datapointabcdefghijx7405065257y7107170375a calculate the covariance. give your answer
Modify the regular one-sample Wilcoxon W by replacing the ranks 1, 2, 3, 4, 5, 6, 7, 8 by the scores 1, 1, 2, 2, 2, 2, 3, 3, to obtain W1. Compute the mean and variance of W1.
A manager of a supermarket estimated that 87% of customers use coupons in their grocery purchases. How large a sample is required to estimate the true proportion to within 0.01 with 98% confidence?
What is the variance of the Control-In scores for the athletes? What is the variance of the Control-In scores for the non-athletes?
An elevator has a uniform distribution ranging from 0 to 4 minutes a) find the mean and standard deviation of x, the time a customer on the second floor waits for an elevator.
Based on this information, if department employee selects random sample of n = 9 containers, determine probability that mean volume for sample will be greater than 1.01 gallons?
The focus is to examine risk management in Norwegian oil and gas industry with the case study of Statoil. Data will be collected through survey questionnaires. The dissertation words count is between 15,500 plus.
A point Y is selected at random from interval (0,1). Then another point X is chosen at random from the interval (0,Y). Find probability density function for X.
Find that a random sample of 14 similar cars has a mean of price of $19,850 with a standard deviation of $1084. Is there enough evidence to reject the salesman's claim at "alpha" = 0.05?
Let X1, ..., Xn be a random sample from a two-parameter exponential distribution, Xi ~ EXP (theta, eta). (a) Assuming it is known that eta = 150, find a pivotal quantity for the parameter theta based on the sufficient statistic.
Is a weight fain of 15 pounds of (6.8) kilograms unusual? Why or why not? If 15 pounds (or6.8kilograms) is not unusual does that support the legend of the "freshman 15"?
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