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A random sample of 121 checking accounts at a bank showed an average daily balance of $280. The population standard deviation is known to be $60. Is it necessary to know anything about the shape of the distribution of the account balances in order to make an interval estimate of the mean of all the account balances?
When groups are more alike than different, ANOVA assesses the significance of the difference between two groups. When groups are unalike, will findings be more significant?
Use simple exponential smoothing with α = 0.33 to forecast battery sales for February through May. Assume that the forecast for January was for 22 set of tires.
At the 0.05 level of significance, test whether the mean baseline body mass index for the population of middle aged men who develop diabetes is equal to 24.0 kg/m 2 , the mean for the population of men who do not. What is the p-value of the test?
Strack, Martin, and Stepper (1988) found that people rated cartoons as funnier when holding a pen in their teeth (which forced them to smile) than when holding a pen in their lips (which forced them to frown). For this study, identify the independ..
A researcher used stepwise regression to create regression models to predict Birth-Rate (births per1000) using five predictors:
Use the following data to write the normal equations of the linear regression between Y and X, and find the least squares regression.
If a pregnancy length is randomly taken from this distribution, what is the probability that the length of that pregnancy is less than 260 days?
State the decision rule. Compute the value of the test statistic. What is your decision regarding the null hypothesis?
If out of a random sample of college students expressed an intent to vote, can the aide's estimate be rejected at the level of significance? Perform a one-tailed test.
A random sample of 20 single men were asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that at least 18 of the men will say yes.
Suppose the credit center selects five cardholders at random. What is the probability that all five cardholders will pay their new monthly balance in full before the payment due date?
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence.
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