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If r= -0.665 and n= 6, test the significance of the correlation coefficient at a = .05 reject p= 0 because 2.68> 2.57
Do not reject p= 0 because -1.78<2.57
Do not reject p=0 because -1.78< 2.54
Do not reject p= 0 because 2.68< 2.54
Assume that these two ways to buy tickets are independent. The probability that someone who tries to buy tickets through the Internet AND by phone will obtain tickets is equal to?
for a two tailed hypothesis test of a difference of means with icircplusmn.05 and df30 we have the following critical
Find the probability that a random selection of 9 songs will have mean length of 186.30 seconds or less. Assume distribution of the lengths of the songs is normal.
Use Hypothesis testing to determine if the data indicate that there are significant differences among the three therapies? Test at the .05 level of significance.
question 1 what is the difference between the chi-square test for goodness-of-fit and the chi-square test for
A college is considering making the purchase of a laptop computer a requirement for some of its programs. In the past, only 20% of students owned laptop computers. A random sample of 300 students revealed that 77 of them had laptop computers
Compute the 99% confidence interval for the population mean based on the sample 62, 68, 61, 64, 65, 62, and 66. Then, change the number from 66 to 16 and calculate the confidence interval.
some plastic rods are automatically cut into lengths of 6 in. actual lengths are normally distributed about a mean of 6
a pharmaceutical company conducted a study to evaluate the effect of an allergy relief medicine 250 patients with
What reasons for complaints do you think the hotel should focus on if it wants to reduce the number of complaints? Describe.
1. a certain lot of bulbs has 10 bulbs of which 3 are defective. assume that 4 bulbs are are drawn at random one by one
Find out the expected shape of distribution of sample mean?
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