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Digital cameras have taken over the majority of the point-and-shoot camera market. One of the important features of a camera is the battery life as measured by the number of shots taken until the battery needs to be recharged. The data in the file Digital cameras contain the battery life of 31 subcompact cameras and 15 compact cameras (data extracted from "Cameras," Consumer Reports, November 2006, pp. 20-21).
a. Assuming that the population variances from both types of digital cameras are equal, is there evidence of a difference in the mean battery life between the two types of digital cameras (α= 0.05)?
b. Determine the p-value in (a) and interpret its meaning.
c. Assuming that the population variances from both types of digital cameras are equal, construct and interpret a 95% confidence interval estimate of the difference between the population mean battery life of the two types of digital cameras.
Bags of cookies that have weights in the upper 7.5% are too heavy and must be repackaged. What is the most a bag of cookies can weigh and not need repackaging?
Suppose that your company manufactures computer equipment and you must determine if a supplier of your company meets the required product specifications.
The following indices: z, t, F, r, Chi square. Using the data below, show that analyses using each of the three statistics yields the same or similar outcomes.
Find the average of the three trials, so the correct number of significant figures, and decide if these measurements gave an accurate result.
The central university has a student population of 60000. The university is interested in determining what proportion of them is in favour of a new grading system.
A nursing professional conducts an analysis to examine scores on the mental health service and treatment outcome questionnaire.
Assuming 250 of each sex, can we conclude that there is a significant difference in the proportions at a 0.05 level of significance?
At the .05 significance level, can we conclude that the guideline is still reasonable?
If all the other quantities remain the same, how does the indicated change affect the width of the confidence interval?
Explain what property associated with the Central Limit Theorem you consider the most important contribution, enabling the use of the normal distribution for sample means.
Think about a real life situation that follows a linear equation, with the independent variable being years. What would the slope tell you about future years?
Three vehicles with a carrying capacity of 12 passengers each are used to ferry 30 international tourists and 5 local tourists from or tambo airport to vilakazi street,soweto. if the logistics manager randomly assigns the tourists to the vehicles, in..
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