– Minitab Statistics

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Complete the following exercises. Remember, when including the results of your statistical analyses display your test statistic, degrees of freedom and the P-value. Answer the questions by adding to this document and copy and paste any graphs from Minitab into this document.

i'm looking for good grade from (60-65 marks)

please find the attached files

one of them is handout. i'll added the handout in next update

the second one is assignment questions.



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Research & Enterprise – Minitab Statistics Assignment. Complete the following exercises. Remember, when including the results of your statistical analyses display your test statistic, degrees of freedom and the P-value. Answer the questions by adding to this document and copy and paste any graphs from Minitab into this document. Then save your file as a .pdf and submit it to Turnitin before the deadline: Friday 31st March at 4pm. Exercise 1: You are conducting an experiment that investigates the effect of 5 different antibiotics on the growth of Campylobacter jejuni. You have obtained the following data: Antibiotic 1 2 3 4 5 150 250 100 170 160 90 210 130 230 120 Growth (cfu) 40 190 160 200 120 70 220 180 180 150 110 170 120 160 190 Questions: a) What is your null hypothesis? (2 marks) b) What is an appropriate statistical test to test H0? (2 marks) c) What preliminary test must be carried out? What are the results of this test? (5 marks) d) What are the results of your analyses? (5 marks) e) What conclusion(s) do you draw? (5 marks) Exercise 2: A physiological study has investigated the energy used when resting over a range of temperatures. Temperature (oC) 0 5 10 18 26 34 Energy Used (kcal) 25 23 24 20 15 14 Use regression analysis to determine whether there is a linear relationship between Temperature and Energy used. Questions: a) Which is the dependent variable and which is the independent variable? (2 marks) b) Produce a scatter plot showing the regression line, making sure that you fully label the axes correctly (Copy & Paste) (5 marks) c) Write down the regression equation. (2 marks) Using the equation, how many calories would you predict would be used at a temperature of 25oC? (3 marks) d) What is your value for R2? (2 marks) What does this indicate? (2 marks) e) What is the slope of the regression line? (2 marks) Is it significantly different to zero? (2 marks) Exercise 3: You are investigating the white cell counts of patients with and without leukaemia. You have collected samples from patients during their illness and after recovery. The following counts were obtained (number of cells x109 per litre): Sick 33 19 10 14 25 23 13 13 29 16 11 9 24 19 10 Healthy 20 15 10 5 20 15 10 5 20 15 10 5 20 15 6 Questions: a) What is your null hypothesis? (2 marks) b) What is the appropriate parametric statistical test to test H0? (2 marks) Show that it is appropriate to use a parametric test. (3 marks). c) Produce interval plots for the 2 groups showing 95% confidence intervals. (3 marks). d) What are the results of your parametric analyses? (3 marks) e) What conclusions do you draw? (2 marks) f) What results do you get if you repeat this using the appropriate non-parametric test? (3 marks) g) Are your conclusions the same? (2 marks)
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Explanation & Answer

Please find the answer in docs file.Thank you.

Null Hypothesis, Ha: The mean growth of Campylobacter jejuni is same when using five
different antibiotics. In five different samples.
Alternative Hypothesis, Ha: At least one of the antibiotic has different effect on the growth
of Campylobacter jejuni.

As we have more than two samples therefore appropriate statistical test would be one way
ANOVA so as to compare more than two mean.

The following are the important assumption of ANOVA in order to carry out the process of
ANOVA:
• The samples are independent of each other.
• The samples are normally distributed.
• There is an equality of variances among groups.

As it can be seen that different antibiotic effect on growth are independent of each
or does not dependent on the any other antibiotic, therefore the first assumption is
met.
Normality Assumption
The null and alternative hy...


Anonymous
Really useful study material!

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