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Q1) Advertisement for particular tax preparation software package claims you can complete your taxes in less than 56 minutes. Random selection of 49 individual's tax preparation times (using software) was collected, and their mean was computed to be 55 minutes. It is known that standard deviation is 4 minutes. Test hypotheses for questions 10, 11, and 12:
H0: μ ≥ 56
Ha: μ < 56(Claim)
i) Calculate the test statistic:
ii) Determine the p-value of the test-statistic:
iii) Is there sufficient evidence to support = claim at significance level alpha = .05? Why?
Engineer suspects that cutting speed (in inches) and feed rate (inches/minute) influence surface finish of metal part. For study engineer collected 4 cutting speeds and 3 feed rates and conducted a 2 factor experiment to get the data in Table with three replications. Carry out ANOVA at α = 0.05 to test for significance of all possible effects.
Table
Feed Rate
Cutting Speed
0.10
0.20
0.30
100
54, 60, 65
79, 68, 80
99, 88, 94
200
98, 89, 94
98, 106, 90
100, 98, 108
300
109, 98, 89
100, 108, 94
99, 82, 102
400
112, 100, 82
94, 104, 108
98, 116, 106
Consider the following time plot of the values of variable Y for each month of a 60-month period. This plot displays
When the Sharpe Ratio for the market portfolio is 0.5, what risk-free rate Rf is the market anticipate? Draw on a diagram for the Capital Market Line derived from the above data. Make sure to clarify the intercept and the slope.
Use simple exponential smoothing with α = 0.3 to forecast battery sales for February through May. Assume that the forecast for January was for 22 batteries.
What percent of sales representatives earn more than $42,000 per year?
Researcher is interested in testing whether there are differences in mean between population one and population two.
Elucidate this data use an appropriate statistical test to explain whether the population mean TV "on" time has declined in the past decade.
If the agency is risk neutral, use a decision tree to determine its best course of action.
A certain airplane has 2 independent alternators to provide electrical power. The probability that a given alternator will fail on a 1 hour flight is 0.02. What is the probability that (a) both will fail? (b) Neither will fail? (c) One or the othe..
How many degrees of freedom must researcher use in her t-test critical value supposing that variances are equal?
Testout the significance of the sample correlation also develop regression equation with scatter plot. Calculate chi-square is less than the critical value
Determine the probability that mean annual snowfall during 40 randomly picked years will exceed 111.8 inches?
Compute mean x and standard deviation s of data above. Calculate Ho by using traditional/classical method.
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