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A random sample of 25 customers at the checkout in a small local supermarket revealed that they had spent the following amounts in the supermarket ($):
25 45505963538054 1218272930 65501572437160355549 15 54
(a) Give a point estimate for the mean amount per customer spent at the supermarket.
(b) Give a 99% confidence interval estimate for the mean amount per customer spent at the supermarket.
Test the hypothesis, at the 0.05 level of significance, that the size of a family is independent of the level of education attained by the father.
The standard deviation of this poll is 4%. What would be the standard deviation if the sample size were increased from 93 to 187?
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches?
The article can be on Descriptive Statistics, Probability and the Normal Distribution, Sampling and Sampling Distributions, Regression Analysis, or Time Series Forecasting.
Do men and women have different beliefs on the ideal number of children in a family? Based on the following GSS2008 Data and the obtained t statistics, what would you conclude?
A chocolate bar is considered underweight if it weighs less than 8.0 oz. What proportion of chocolate bars weighs less than 8.0 oz?
Determine the standard error of students that favoured the move.
Compute a 95% confidence interval for the population mean, based on the sample 1, 2, 3, 4, 5, 6, and 30. Change the number from 30 to 10 and recalculate the confidence interval.
You attempt a 50 item (n = 50) true-and-false exam. You did not study for the material and your attempt to answer any item is a guess, with a 50% chance that you will get any item correct. You need a score of 30 or better to pass the exam.
Suppose a sequence of independent trials is performed where each trial results in either success or failure. Suppose X=the number of failures before the first success, with p=probability of success on any one trial.
The average service time at CheesePlate Restaurant is 3.5 minutes with a standard deviation of .04 minutes. A new order system claims it can improve service time
The probability of occurrence (P(X)). Compute the Expected Value (Mean), The Variance, and The Standard Deviation for this random variable.
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