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Food Processor wants to compare two preservatives for their effects on retarding spoilage. Suppose 16cuts of fresh meat are tread with preservatives A and 16 are treated with preservative B, and the number of hours until spoilage begins is recorded for each of the 32 cuts of meat. The result asa summarized as
Sample mean of Preservative A =108.7 hoursSample mean of Preservative B =98.7 hourSample Standerd Deviation A=10.5 hoursSample Standerd Deviation B=13.6 hour
a) State the null and alternative hypotheses to determine if the average number of hours until spoilage begins differs for the preservatives A and B?
b) Analyse sample variances in order to find which test would likely be most appropriate to employ to test the equality of the population means, pooled or unpooled?
c) Calculate the pooled variance and the value of the test statistic.
At the 5% level of significance, can we infer that branch A has a significantly higher proportion of satisfied customers than branch B?
The null hypothesis is to be tested at 95% confidence. Determine the critical values for this test.
Assume that the process is in control and that the population of all jar fills is normally distributed. (Round the z-values to 2 decimal places and final answer to 4 decimal places. Negative amounts should be indicated by a minus sign.)
For the following data set, indicate whether the shape of the distribution is normal, positively skewed, or negatively skewed. Provide evidence for your answer by calculating the mean, mode, and median.
Probability distribution described by the following density curve and The expected value of the sum of the weights of the two oranges, in pounds
Use a 5% significance level (95% confidence level) to test the claim that the different vehicle categories have the same mean MPG.
Plot the data on the same line and give your impression regarding any apparent differences between the two companies.
An economist is interested in studying the spending habits of consumers in a particular region. The population variance is known to be $1,000,000. A random sample of 50 individuals resulted in an average expense of $15,000. What is the width of th..
Bell-shaped with a mean of $45, 000 and a standard deviation of $3, 500. What percentage of teachers earn anywhere from $38, 000 to $48, 500?
The heights, in feet, of the five tallest buildings in four large cities are compared. What is the critical value if the level of significance is 0.10?
The mean age of adult learners in a chosen class of 31 students is 33.8 years. The standard deviation is equal to 7 years.
Suppose that population standard deviation is known to be 10mmHg and samples are from Normal population, test a= 0.01 if blood pressure reading is different from 135mmHg
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