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A medical researcher estimates that no more than 55% of U.S. adults eat breakfast every day. In a random sample of 250 U.S. adults, 56.4% say they eat breakfast every day. At 945; = 0.01, is there enough evidence to reject the researcher's claim? What is the critical value?
a. 2.33
b. 1.89
c. -1.89
d. 3.0
What is the role of probability concepts in business decision making? Define probability concepts.
Dana and Cathy are playing tennis. The probability that Dana wins at least one out of two ames is 0.3. What is the probability that Dana wins at least one out of four?
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
A soft drink bottling machine is set to dispense soft drink into containers labeled 16 ounces. While the actual quantities vary they are normally distributed with a mean of 16.1 ounces and a standard deviation of 0.015 ounces.
The president of an agency specializing in public opinion surveys claims that approximately 70% of all people to whom the agency sends questionnaires responds by filling out an returning the questionnaire.
Did you find any outliers on the dependent variables that were due to errors of coding? If so, what and why? How would you correct an error of coding?
In a random sample of 26 people, the mean number of books they had read in the past year was 14.93 books and the standard deviation was 16.60 books.
Suppose you toss a die 100 times in a row. What is the probability that you see 4 spots between 10 and 20 times?
Langewitz, Izakovic, and Wyler (2005) reported that self-hypnosis can significantly reduce hay fever symptoms. Patients with moderate to severe allergic reactions were trained to focus their minds on specific locations where their allergies do not..
A researcher claims that the average age of people who buy lottery tickets is 64. A sample of 30 is selected and their ages are recorded as shown below.
Shipment costs are given in table below. Where no cost is provided, shipments are not possible. Where costs are given, shipments are possible in either direction. Sketch network model for this problem.
Research question : At α = . 01, is degree of certainty independent of credits earned?
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