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In a survey to assess the adequacy of parking facilities at a shopping precinct a questionnaire was given to local motorists and included the following questions. (a) have you ever driven a car? (b) what is your income group? (c) where do you park? In groups, comment on these questions and formulate other questions which you believe should be in the questionnaire. Would a postal questionnaire within the postal code (zip code) of the supermarket be adequate for the parking survey above? Share your answers.
The batteries used in a digital watch have an operating life that is normally distributed. As sample of 18 batteries reveals a mean of 2.35 years and a standard deviation of 0.4 years.
a purse contains 101 in anthony dollars and 1 in pennies. smith is allowed to draw and keep coins one at a time until
The Bunte Auto Repair Shop received a shipment of four carburetors. One is known to be defective. If two are selected at random and tested.
students enrolled in an introductory statistics course at a university were asked to take a survey that indicated
a recent poll of 700 people who work indoors found that 278 smoke. if the researchers want to be 98 confident of their
The annual returns, in percentages, on stocks A and B for three possible states of the economy are given in the table below.
Suppose your data is approximately normally distributed with a mean 25 and standard deviation 15. What is the approximate 97.5th percentile of your data?
if you had the chance to set up a simple experiment at your workplace to test a hypothesis would you have your research
during ejection from a military airplane the pilots acceleration must not exceed 16g ig injury is to be avoided.
a standard deck of cards contains 52 cards. one card is selected from the deck.a compute the probability of randomly
What is the probability that exactly two accidents will occur in a particular two-day interval? What is the probability that one will have to wait at least two days to observe the next two accidents.
She is interested in testing the null hypothesis that the mean SAT score is the same for each type of schooling using the one-way ANOVA. Some summary statistics for the three groups are given below, followed by the one-way ANOVA table.
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