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A manufacturer of chocolate chips would like to know whether its bag filling machine works correctly at the 433 gram setting. It is believed that the machine is underfilling the bags. A 26 bag sample had a mean of 427 grams with a standard deviation of 15. Assume the population is normally distributed. A level of significance of 0.05 will be used. Find the P-value of the test statistic.
Joan's nursery specializes in custom-designed landscaping for residential areas. the estimated labour cost associated with a particular landscaping proposal is based on the number of plantings of trees,shrubs and so on to be used for the project.
What is the null hypothesis in a chi-squared test of independence? How many 'tails' can a chi-squared test have, one or two? In a regression analysis, what do the residuals from the fitted line add up to?
1. estimation of mean monthly rentalsa suppose we consider the following data on monthly rentals 980 1230 1320 1440
Assuming this is literally true, how can it be explained? What facts and/or statistics would you need to know to expose this misleading claim?
Which of the numbers you calculated is a better measure of the central tendency of the heights given? Give a specific statistical reason for your conclusion.
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of 3.3 emails per hour. Assume the arrival of these emails is approximated by the Poisson distribution.
Clinic evaluates that true population standard deviation is around $1,300. If confidence level is 95%, determine the required sample size in order to meet desired accuracy.
Suppose Abraham Lincoln had answered a survey questionnaire in which he indicated that he had not received a grade school diploma. The researcher found that Lincoln's educational score did not correlate with the expected variables. What was wrong?
What are the differences between a two sample t-test and ANOVA hypothesis testing? When would you use ANOVA at your place of employment, in your education, or in politics?
Assuming this is literally true, how can it be explained? What facts / statistics would you need to know to expose this misleading claim?
What is the percentile rank for someone who got 350 points and what percentage of students had between 275 and 375 points?
What is the critical F value for a sample of 21 observations in the numerator and 15 in the denominator? Use a two-tailed test and the 0.02 significance level. (Round your answer to 2 decimal places.)
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