Question

FILE TOOLS VIEW Documents - Word (Product Activation Failed) 4. a. Distinguish between stratified random sampling and cluster sampling. [4 marks] i. Compute mean of the samples. [4 marks] ii. Compute standard deviation of the samples. [6 marks] b. iii. Test this hypothesis and find out the decision the null hypothesis is accepted or rejected. [6 marks] The mean length of a small counter balance bar is 40 millimeters. The production supervisor is con- cerned that the adjustments of the machine pro- ducing the bars have changed. He asks the engi- neering department to investigate. Engineering department selects a random sample of 10 bars and measures each. The results are reported in millimeters. Is it reasonable to conclude that there has been a change in the mean length of the bars? Use the 0.05 significance level. 42 39 42 45 43 40 39 41 40 42 End of document

Answer 1

Page No.: Data: Answer D. Stratified random Sampling is a method of sampling that involver the division of a population into smaller groups known as strata. It stratified random sampling the strata are formed based on membere shared attributes or characteristics in cluster sampling. Nr In the cluster Sampling reasercher divides the population into seperate groups Called clusters, then a simple random no of cluster is selected from the populah on the reasercher conduct hic analysis on data from the sampled Cluster. stndart trong b) O mean = EXI-4103075 10 n (1) - - SD . 16889 {(xi-x)² hull and alternative hypothese Ho: Mi 40us nii mit 40. Z - 4 - 2018 3/h = 2.18 And that are 2,26. tcall tabl ie 2018 < 2.26 we reject Но Conclusion: There Scanned beth means CamScanner is at no significance dift. bar