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Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10. The upper and lower control limits, respectively, for an
R-chart is:
a. 0.0373 and 0.1864.
b. 0.223 and 0.
c. 0.0136 and 0.1864.
d. 0.223 and 0.1777
Compare value of test statistics F obtained in part(2) with value of t 2 , square of test statistic for testing H 0 : β 1 =0 that was needed in test null hypothesis that true slope is 0. Interpret the results of this test.
At the .05 significance level, can she conclude that there is a difference in the mean amount of weight loss among the three diets?
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
Now compute the standard deviation for this distribution.
Interpret the correlation between each set of variables.
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
Two types of flares are tested for their burning times (in minutes) and sample results are given below.
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
A university found that 20 percent of its students withdraw without completing the introductory statistics course. 20 students registered for a section of the course this term.
Assume if random samples of size n = 9 are selected can we say anything about the distribution of sample means.
Write down the probability of that the median of the sample or average medians is greater or more than 320 minutes?
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
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