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The weights of dormitory cockroaches follow a normal distribution. 14% of the dormitory cockroaches weigh below 77 grams and 10% of them weigh above 82 grams. Find the mean and standard deviation of their weights.
Develop a hypothesis to investigate this problem based on the claim of the heat pump manufacturer
Do the data indicate a significant difference? Test with ∝ = .05.
The ________ is the probability of observing a sample value as extreme as, or more extreme than the value observed, given that the null hypothesis is true.
Determine a 95% confidence interval for true mean cost to repair this type of car.
A beverage company is trying to ?nd out the distribution of the breaking strength of their glass bottles. Fifty bottles are selected at random and tested for breaking strength, with the following results (in pounds per square inch):
Provide an example of a situation in which factor analysis, cluster analysis, and multidimensional analysis might be used.
Does this mean immigrants tend to earn more than other people? Or does it mean immigrants improve a state's economy? If not, what could explain the correlation?
Determine the probability distribution associated with these data.
a. Formulate the null and alternative hypotheses. b. Which statistical test would you use? Why?
Do you benefit by using a cum sum chart rather than a control chart?
In business, investors are always interested in the tradeoff between returns and risk. Regression analysis is a statistical technique that can be used to quantify this risk.
Find the standard normal area for each of the following: (Round the answers to 4 decimal places.)
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