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Cashier records from the last year that 35% of all Ralph's grocery store customers use a previously-obtained Ralph's discount card upon checkout. Management suspects the percentage of actual cardholders is higher because some customers may not use their Ralph's during every visit. They decide to sample random customers who enter the store, and ask them if they have a Ralph's card. Suppose they solicit 400 customers one day, and find that 160 of the have a Ralph's card.
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big? U (round to 2 decimal places)=, Q (round to 4 decimal places)=, Probability (round to 4 decimal places)?
What is the probability that 10 or more were male? What is the probability that 10 or more were female? What is the probability that fewer than 7 were female?
The union for a particular industry has determined that the standard deviation of the daily wages of its workers is $20.. A random sample of 100 workers in this industry has a mean daily wage of $116.
A marketing analyst was studying the readability of two advertisements, each produced by a major company, and printed in the newspaper.
A commuter travels many miles to work each morning. She has timed this trip 5 times throughout the last month. The time (in minutes) required to make this trip was 44, 39, 41, 35, and 41.
Make a decision regarding the null hypothesis based on the sample information. Interpret the results of the test and state your conclusion.
r. Patton is a professor of English. Recently she counted the number of misspelled words in a group of student essays. She noted the distribution of misspelled words per essay followed the normal distribution with a standard deviation of 2.44 word..
The percentages of cones sales for chocolate, strawberry, and vanilla, are 75%, 60%, and 40%, respectively. For a randomly selected sale, define the following events:
In a public opinion poll, 48% of 189 respondents favor an elimination of taxes on dividend income.
How many plants must be sampled if no preliminary estimate is available? If less than that many plants is sampled, which answer best describes what happened?
At the .01 significance level, is there a relationship between job pressure and age?
The mean time for the completion of a shopping center is estimated to be 14 months with standard deviation = 4 months. What is the probability that the renters will not be able to move in 19 months?
A fair die is rolled nine times. What is the probability that an odd number (1,3 or 5) will occur less than 3 times?
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