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A recent national survey found that high school students watched an average (mean) of 7.8 DVDs per month with a population standard deviation of 1.00. A random sample of 30 college students revealed that the mean number of DVDs watched last month was 7.30. At the .05 significance level, can we conclude that college students watch fewer DVDs a month than high school students?
Compute the value of the test statistic. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
a) Value of the test statistic
b) What is the p-value?
Find the test statistic value for testing the equality of population means of the two samples.
To test the given claim using Single Proportion Z test.
Jamie expects that a bulb will last for 400 to 500 days, what is the probability of an Acme bulb satisfying that?
Is there a significant difference the four testing conditions?
A bank official reported the results of a regression analysis designed to predict the bank's charges (y), measured in dollars per month, for services rendered to local companies.
The population of IQ scores forms a normal distribution with mean of μ = 100 and a standard deviation of σ = 15. What is the probability of obtaining a sample mean greater than M = 105,
How likely is it that the store owner will make at least $7,000 if she implements your suggestion?
Compute the variance and standard deviation of the number that will arrive within two days.
What is the probability that the mean annual precipitation during 49 randomly picked years will be less than 101.8 inches?
Based on these data, what is the probability that next Christmas will be dry and based on the data,what is the probability that next Christmas will be rainy or cloudy and dry?
The width of a confidence interval will be:
Find out the probability distribution, and the cumulative probability distribution of car arrivals.
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