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The dean of the College of Business at the University of La Verne has observed for several years and found that the probability distribution of the salary of the alumni's first job after graduation is normal. The college collected information from 250 alumni and finds that the mean of their salary is $50k. Assuming a 95% confidence level, please do the following:
1. Suppose that the standard deviation of the collected data from 250 alumni is $10k and the mean is $50k, please estimate the confidence interval of the population's average salary. (Hint: Hypothesis Testing and Confidence Interval - One sample; sample standard deviation is known)
a ball is dropped and lands randomly on a square with length 1 meter.a find the expected distance from the nearest edge
The proportions of cases cleared by arrest for samples of trained and untrained officers are reported here.
In a simple linear regression based on 30 observations, the following information is provided: y = -6.92 + 1.35x and se = 2.78. Also, se(y0) evaluated at x = 30
What is the probability that this card is a diamond or club? - Given that this card is a black card, what is the probability that it is a spade?
Review the Learning Resources for this week related to frequency distributions and graphic displays of data. Using the SPSS software, open the General Social Survey dataset found in this week's Learning Resources.
Use MINITAB or some other computer software to construct a stem-and-leaf display for the following data representing the time to make coke (in hours) in successive runs of a coking oven.
Conduct a one-way analysis of variance test to determine whether there is an overall difference in population mean glutathione levels. Use a = 0.05.
If the null hypothesis is true, then how much difference should be expected, on average, between the two sample means?
With reference to Exercise 40, what can we say with 95% confidence about the maximum error if we use the observed sample proportion as an estimate of the corresponding true proportion?
Imagine that a researcher measured a group of participants at two time points. Fictional scores for these two time points appear below. Are the scores different at time 1 and time 2?
For any hypothesis test, if the value of a parameter being tested falls outside the confidence interval for the same level of a, the correct decision is to reject the null hypothesis. Is this True or False?
Mean annual temperatures for two California cities. Table 28.11 contains data on the mean annual temperatures (degrees Fahrenheit) for the years 1951 to 2005 at two locations in California: Pasadena and Redding.13
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