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1. If you were to conduct right-tailed hypothesis test at 5% significance level, you choose the critical value this way. Assuming that the null hypothesis is true, you will find the value of the test statistic for which the probability of obtaining a value less than the specified value is 0.05. Is this true? Explain answer.
2. The procedure, generally, for deciding whether the null hypothesis should be rejected is that, roughly, there is a range of values of the test statistic which one could reasonably expect to occur if the null hypothesis were true. If the value of the test statistic is one that would not be expected to occur when the null hypothesis is true, then we accept the null hypothesis. is this true? Explain answer.
Is there a significant difference in the average prices for these two different supermarket chains? Test at α = 0.05
The mean increase is $332, and the standard deviation is $108. Give a 99% confidence interval for the mean amount of the increase. Does omitting the annual fee induce customers to charge more on their credit cards?
Would it be reasonable to conclude that the population mean is 63 pounds?
Let Z be a standard normal random variable. Determine the value of c such that P (Z > c) = 0.1251 is there a way to do this step by step so i can understand it?
A nationwide test taken by high school sophomores and juniors has three sections, each scored on a scale of 20 to 80. In a recent year, the national mean score for the writing section was 47.2 , with a standard deviation of 10.2.
Do you think this detection bias would strengthen or attenuate the association between vegetarian diet and learning disabilities? Defend your choice briefly.
Compute the relative dispersion of each group using the coefficient of variation. Comment on the difference in relative dispersion.
The hypothesis is to be tested at the 5% level of significance. The critical value from the table equals:
Calculate the value of Pearson correlation. Illustrate what information is provided by the numerical value of the Pearson correlation.
Describe a business situation that you have had or might face that will benefit from the use of confidence intervals?
If the average tax payer who makes $140,000 per year owes the government $18,200 with a standard deviation of $1500, and the IRS receives a 1040 tax documents from a customer who earned $140,000 that claims he only owes $12,000, should the IRS sus..
Find the probability that a standard normal random variable will assume a value between: Find a z such that 70% of the area is above that value.
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