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Test the given problem using independent sample z -test
A candy company wants to identify whether or not the size of its' candy bars are the same length from one day to another. On day 1 they sample 52 candy bars with an average mean of 5.4 inches and on day 2 they sample 52 bars again with and average mean of 5.6 inches. Both days have sample standard deviations of 3.4. Is the average mean of size different from day 1 to day 2?
From past data, it is recognized that company's production process results in normally distributed yield strengths. Test company's claim at a = 0.05.
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
What can be completed to remedy multicollinearity.
Determine a 95% confidence interval for proportion of all voters in favour of candidate.
Compute the 95% confidence interval around the mean of each of the three groups and plot the confidence interval in the space provided above.
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
If we fit the least-squares line to the 12 data points (one for each month) we obtain the following results from a software package. Notice that temperature is taken as the explanatory variable and crawling age as the response.
Find the probability that the number of who consider themselves basketball fans is :
Generate a relative frequency histogram using ten-point intervals to show the distribution of the scores.
We are interested in comparing the proportions of males and females who think earning a large salary is very important to them. I surveyed 200 of each gender and recorded their answers to the question as yes or no.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
Based on the scatter diagram, does there appear to be any relationship between the number of assemblers and production? Explain.
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