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At the beginning of the course of Statistical Methods I, the instructor recommended that students devote 3 hours per week for the duration of the 13-week semester, for a total of 39 hours. It is known that the time spent on studying statistics follow a normal distribution. Throughout the course duration, students were claiming that they were following the instructor's recommendation. At the course completion, a random sample of 10 students enrolled in the course was drawn where each student was asked how many hours he or she spent doing homework in statistics. The data are listed below:
45
38
37
40
44
46
42
43
While dealing with 16 students, suppose that the alternative hypothesis has been one-sided and that it was set as Ha: m < 39. Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test (the level of significance needed to reject the null hypothesis) would be higher than, lower than, or the same.
At 5% level of significance, is there evidence of difference in mean life of bulbs made by the 2 kinds of machines. What is your conclusion?
Find the value of Z-score- standard normal distribution.Find out a value of the standard normal random variable z, call it z0.
At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
At 0.01 significance level can we conclude that mean fare has increased? Determine the p-value?
Develop a 95% confidence interval of the difference between the daily population means for the two airports.
Explain a Type I error for this situation. Explain a Type II error for this situation.
Find out the probability that the return for common stocks will be more than 0%.
To findout 95 percent with confidence interval for the mean amount a citation. Police Chief Aaron Ard of River City reports 500 traffic citations were issued last month.
Which of the following(s) can be considered (a) variable(s)?
The analysis of variances produces df between = 3 and df within = 24. For this analysis, determine df total ?
Where S, A, and R are measured in dollars per week. Vanguard's marketing director is comfortable using parameter estimates that are statistically significant at the 10% level or better.
A sample of 50 provided a sample mean of 14.15. The population standard deviation is 3.
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