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1. What is sampling? Briefly explain the various methods of sampling.
2. A company appoints four salesmen, A, B, C and D, and observes their sales in three seasons- summer, winter and monsoon. The figures ( in lakhs) are given in the following table:
Season
Salesman
A
B
C
D
Total
Summer
36
21
35
128
Winter
28
29
31
32
120
Monsoon
26
112
90
93
81
96
360
Carry out an analysis of variance at 5% level of significance.
Bivariate data for the quantitative variables x and y are given in the attached. These data are plotted in a scatter plot. Sketch an approximation of at the least-squares regression line for the data.
A sample of 8 jars has a mean of 15.6 ounces and a standard deviation of 0.3 ounce. Is there enough evidence to support the consumer's conjecture at a = 0.05? First, identify the alternative and the null hypotheses.
Discuss how t test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score.
Sixty-four students in an introductory college economics class were asked how many credits they had earned in college, and how certain they were about their choice of major.
ABC Manufacturing has six machines that perform particular task. Breakdowns happens frequently for this machine. Past records indicate that the number of breakdowns that happen each day is described by the probability distribution seen below:
A recent study compared the time spent together by single- and dual-earner couples. According to the records kept by the wives during the study, the mean amount of time spent together watching television among the single-earner couples
Gender differences in dream content are well documented (Winget & kramer, 1979). Suppose a researcher studies aggression content in the dreams of men and women.
Electronic teller machine during the prime shopping hours in a department store. What is the probability that Exactly six people will use the machine during a randomly selected hour.
Your company manufactures low calorie frozen dinners. The advertised calorie content is 200 calories. A consumer activist group, FACT: fat and calories tribunal, is claiming that your product is not consistent.
Do a feasibility study to assess the likelihood of the project being completed and producing useful results. If possible, the feasibility study should contain some preliminary results (e.g. a pilot data set and initial data analysis).
Listed below are the commissions earned ($000) last year by the sales representatives at the Furniture Patch, Inc.
Assume that a random variable, x, is distributed according to a normal distribution with mean 12 and standard deviation 2. Find the z-value if:
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