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A random sample of 30 households was selected as part of a study on electricity usage, and the number of kilowatt-hours (kWh) was recorded for each household in the sample for the March quarter of 2006. The average usage was found to be 375kWh.
In a very large study in the March quarter of the previous year it was found that the standard deviation of the usage was 81kWh. Assuming the standard deviation is unchanged and that the usage is normally distributed, provide an expression for calculating a 98% confidence interval for the mean usage in the March quarter of 2006.
It is believed that the standard deviation from the population has changed and thus is unknown. However, from the small data set in 2006, we know the sample standard deviation is 91.5kWh. Assuming that the usage is normally distributed, provide an expression for calculating a 98% confidence interval for the mean usage in the March quarter of 2006.
Construct a? 90% confidence interval for the population proportion of women who most feared breast cancer. Interpret.
Develop a complete sales presentation that can be given in eight minutes. Include the buyer-seller dialogue. Make sure the appropriate components
a company decides to add a new program that prepares randomly selected sales personnel to increase their number of
De?ne what is meant by a continuous variable and give some examples. De?ne what is meant by a continuous probability distribution.
Assuming that the scores on a math achievement test are normally distributed with mean µ = 68 and standard deviation σ = 10, what is the probability of getting a score greater than 78?
What is the main limitation of the z test and what alternative exists that does not have that limitation - Explain what statistical inference can be made
As part of a data base on new births at a hospital some variables recorded are the age of the mother, marital status of the mother (single, married, divorced, other), weight of the baby, and sex of the baby. Of these variables
1. When you construct a 95% confidence interval, what are you 95% confident about? 2. What is the effect of sample size on the width of a confidence interval?
If she performs 15 demonstrations this week, what is the probability of her being satisfactory? What is the probability of between 4 and 8 (inclusive) orders?
What is the probability that no more than two of the three are commercial successes?
Assuming normal populations and using the 0.025 level of significance, can we conclude that the new music theme is better than the old in terms of increasing the pulse rate of viewers? What is the most accurate statement that could be made about t..
The sample space that describes the two-way classification of citizens according to gender and opinion on a political issue.
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