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Question: The high temperatures for a random sample of 6 days in July are:
85 86 90 77 81 88
At Alpha = .10, is there sufficient evidence to conclude that the standard deviation is less than 10 degrees?
If 25 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 44.24 tons. Assume that the variable is normally distributed.
Find out the probability that: First electric brush chosen is defective?
If 36 of these repair bills are randomly selected, find the probability that they have a mean cost between 271 dollars and 273 dollars.
The number of runs with respect to the sample median is:
The random variable x is the number of houses sold by a realtor in a single month at the Sendsom's Real Estate office. Its probability distribution is as follows.
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
A manufacturer wants to increase the shelf life of a line of cake mixes. past records indicate that the average shelf life of the mix is 216 days. after a revised mix has been developed, a sample of nine boxes of cake mix gave these shelf lives (i..
The researchers claimed that of those who completed the program, 85% improved. What possible confounds can you identify in this study?
What are independent samples? What is a pooled estimate of variance and why do you need to calculate it? When do you use a dependent versus an independent sample t test?
The sums of squares appear in the following ANOVA summary table. The mean for each condition and the condition and the number of subjects precondition are also noted.
We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as yes or no.
Use alpha level. 05 to compute and interpret Pearson's r and to test whether it is important (using all your steps for hypothesis test).
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