The Human Resources department in the company above where the daycare survey was
ID: 3178507 • Letter: T
Question
The Human Resources department in the company above where the daycare survey was taken estimates that 55% of employees would like onsite daycare. Does your interval support or refute their statement? Explain your answer. A consumer research group is interested in how older people view hybrid cars. Specifically, they wish to assess the percentage of drivers in the US 50 years of age or older who intend to purchase a hybrid in the next two years. They used a list of A ARP members for the sampling frame. Based on a systematic sample they estimate the percent to be 17%. Define the target population. Define the parameter. What is the statistic? What is the sample? How might the sample be biased? Explain what 95% confidence means in general.Explanation / Answer
a) Target popultion is the US old citizens who desired to have a hybrid car
b) Parameter : proportion of popultion is the parameter. We calculate mean based on sample population.
c) We Use Z statistic, to estimate the mean differences
d) Sample is collected from a whole US citizens who have 50 years atleast
The sample is collected by method of systematic sampling.
It involves collecting data from every nth person.
e) nth person sampling involves lot of biases. also selecting of region for the sapling is important. there is a possibility of asking same person when every nth person is asked for decision
4) 95% confidence interval means the range of the response varies with respect to mean on both sides to 47.5% on right and 47.5% on left sides
The data follows a normal distribiution in which 95% of values are covered in the range
The values which fall under 95% are acceptable, others are rejected
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