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IQ test was administered to 5 person before and after they are trained.The result are given below:
Candidates: 1 2 3 4 5
IQ before training: 110 120 123 132 125
IQ after training: 120 118 125 136 121
Test whether there is any change in IQ after the training program (The absolute value of 1 for 4 degrees of freedom at 1% level for one-tailed and two tailed tests are 3.747 and 4.604 respectively)
Regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1, and 6. At the .05 level of significance, is there convincing evidence that the number of absences per employee has increased?
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and = 0.01. What are the critical values?
Clearly identify the independent and dependent variables you would study. Determine whether a one-tail or two-tail test is most appropriate and explain why. Generate a testable null statistical hypothesis and an alternative statistical hypothesis.
The probability that a parolee will commit a crime while on parole is 0.68. A parole officer is in charge of 8 parolees. What is the probability that at least 7 of them will commit a crime while on parole?
illustrate briefly how an experimental study is conducted. What is the difference between the two types of variables used.
33 on WSPD (channel 13). At the .05 significance level, is there a difference in the proportion of viewers watching the three channels?
A sample is taken prior to a major election of likely voters. The null hypothesis is that the votes will be split 50/50. One candidate gets 54% of the support in the sample and the p-value for this sample is calculated to be 0.12.
Assuming 250 of each sex, can we conclude that there is a significant difference in the proportions at a 0.05 level of significance?
To avoid losing money, the top 5% (the heaviest 5%) is labeled overweight. A) What proportion of boxes is underweight?
Findout the probability value for normal distribution. Illustrate the weight of football players is normally distributed with a mean of 200 pounds also a standard deviation of 25 pounds.
Explain the terms: simple random sampling , systematic sampling, stratified sampling, cluster sampling and what is a time series? Explain the 4 main components of a time series.
To get a sense of the data, provide two well labeled scatter-plots of 1) revenue vs. budget, and 2) revenue vs. screens. Also, provide a correlation matrix of these three variables
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