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1. Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 102.9 hours and a standard deviation of 16.5 hours. The best 65% of batteries would last beyond how many hours? Answer correct to 2 decimal places
2. The average and standard deviation of the amount of Goods and Services tax remitted by performance artists in a twelve month period were $5.042 thous and $1.551 thous respectively. If a sample of 110 artists was taken, find the average value above which only 15% would lie. Give your answer in dollars to the nearest dollar.
Does the data prove a significant difference in mean times?
Which measures of central tendency will always have but one (1) value for a set data?
Sampling area consisted of an area of 120m x 50m within site two and was bordered by a road on one side and a stream on another.
Support colour-coding on packaged food to indicate healthier options
Using the 0.10 level of significance, is there evidence that the population mean is above $300?
Give the 90% confidence interval for the mean score in the population of all young women.
For each problem, compute a Welch F-statistic and determine whether or not significant differences exist among the treatment conditions.
Two mating parts have critical dimensions x1 and x2 as shown below. Assume that x1 and x2 are normally distributed with means 1 and mean2 and standard deviations s1 = 0.400 and s2 = 0.300.
Given are five observations collected in a regretion study on two variables: What is the value of the standard error of the estimate?
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
f x has a normal distribution with mean µ=15 and standard deviation σ= 3, describe the distribution of x values for sample size n, where n = 4, n = 16, and n = 100. How do the x distributions compare for the various sample sizes?
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