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Two companies market new batteries targeted at owners of personal music players. DuraTunes claims a mean battery life of 11 hours, while RockReady advertises 12 hours.
a) Explain why you would also like to know the standard deviations of the battery lifespans before deciding which brand to buy.
b) Suppose those standard deviations are 2 hours for DuraTunes and 1.5 hours for RockReady. You are headed for 8 hours at the beach. Which battery is most likely to last all day? Explain.
c) If your beach trip is all weekend, and you probably will have the music on for 16 hours, which battery is most likely to last? Explain.
1. explain the relationship between variance and standard deviation. can either of these be negative?expline2. find the
Statistical probability is most closely associated with which of the types of statistics - Which of the following sampling procedures represents non-probability sampling - normal distribution probabillity model for the study statistical analysis
a supermarket receives a shipment of 20000 cans of beans. the supermarket picks a random sample 100 cans and finds
Translate this into a statistical hypothesis-testing problem and carry out the test. Be sure to give the null and alternative hypotheses, the value of the test statistic, the p-value, and your conclusions.
there are two major internet providers in the colorado springs colorado area one called htc and the other mountain
What is the difference between the critical-value method and the p-value method of hypothesis testing? Include in your post how the question's topic pertains to your health discipline.
What is the probability that a randomly selected group of 50 shoppers will spend a total of more than $5700? The total will be more than $5700 when the sample average exceeds what value?
When sampling is from a population with standard deviation µ = 55, using a sample of size n = 150, what is the probability that will be at least 8 units away from the population mean µ?
The chart at the right. Does this sample indicate that songs classified as dance music have lower beats per minute than the songs ranked on a Top 200 list?
The following data represent the maximal head measurements (across the top of the skull) in millimeters of 15 Etruscans (inhabitants of ancient Etruria).
Good weather and tipping. Exercise 25.35 (text page 650) gives the data for a study on the effect of a waitress's weather prediction on the tipping percent. Carry out data analysis and ANOVA to determine whether there are differences among the mea..
Compute the average earning per trade. Assume also that the sample standard deviation was $0.5 million and compute a 95% confidence interval for the average earning per trade for all trades made by this banker.
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