) In research requiring selection of a sample from the population, you are to explain why the characteristics of the sample selected is not likely to represent the population parameter exactly.(4 Marks)

b) How does the above conceptual issue constitute a major concern for validity of results obtained from data collected for the research? Describe briefly how this sampling challenge may be overcome.

c) If a random sample of size n=5 with values 21, 23, 17, 16 and 18 were drawn from anunknown population: (Assume Critical two-tailed t-value for DF=5 at 95% to be 2.131)

i) Compute thestandard error of the mean,

ii) Where would the population parameter () be located if the population information were unknown?

d) How would the outcome of your computations in1.c) above be affected using a population of scores with values 19, 15, 18, 22, 21, 23, 16, 17, 24, 25, 17, 16, 23, 24, 19? Explain your observations