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A random samples of 250 bolts manufactured by machine A and 200 bolts manufactured by machine B showed 24 and 10 defective bolts respectively. Test the hypothesis that the machines are showing difference qualities of performance. Use 5 per cent level of significance.
The company you work for employs 585 assembly-line workers - 526 men and 59 women. 16 men and 10 women have been laid off.
Predictors YearHire (year when the individual was hired), Race (1 if individual is black, 0 otherwise), and Rank (1 if individual is an assistant professor, 0 otherwise). Interpret these results.
he Department of Motor Vehicles (DMV) can service customers at a rate of 20 per hour (or 1/3 per minute) when it comes to license renewals. The service time follows an exponential distribution.
Nine percent of undergraduate students carry credit card balances greater than $7000. Presume 10 undergraduate students are selected randomly to be interviewed about credit card usage.
Can you please help me develop a research question using gender and another categorical variable associated to adhd that could be address using the chi-square method?
Sun Microsystems has approximately 50% of the high-end Unix machines market with its closest competitor being IBM. Suppose that 15 firms were in the market to purchase a high-end Unix machine. Assume that these firms listened to sales pitches by a..
Assume that for population of students at school, distribution of x is well approximated by normal curve with mean 48 min and standard deviation 4 min.
What are some real life examples of the use of Chi-Square tests using contingency tables? Why is a test, which is testing significant differences among means called Analysis of Variance?
A business researcher uses two-way ANOVA in a report for a client. The researcher does not check the assumptions of using the technique.
A health researcher is interested in determining whether or not the speed at which people walk is related to their cholesterol levels. He picks 100 adult volunteers at random, checks their cholesterol levels, and then times each one while they wal..
At the .10 significance level you will test to determine if there has been an increase in selling time. Assuming we are using a t test what will be the critical value"?
Correlation between the two variables - Evaluate the value of the correlation coefficient.
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