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A sample of 60 infants participated in a test of color preference. Each was put in a special crib where four color patches were projected above the crib simultaneously. Researchers measured the amount of time each infant spent looking at each color. The color receiving the most attention was identified as that infant's preferred color. Here are the preferences for the 60 infants:RED GREEN BLUE YELLOW 21 11 18 10 Do these data indicate any significant preferences among the four colors? Test with ? = 0.05 .
Normal distribution with a mean of 8.1 minutes and a standard deviation of 1.9 minutes. For a randomly received emergency call, find the following probabilities. The response time is between 5 and 10 minutes
A group of day to day workers can work either 0 hours, eight hours or 12 hours at a pay rate of $9.75 per hour. (The 12 hour day pays regular time for the first eight hours and double time for the remaining four hours.
Both SAT and ACT scores are normally distributed. What is the probability that a randomly selected high school senior's score on the mathematics part of the SAT will be more than 630?
State the claim mathematically. Then write the null and alternative hypothesis. Determine whether the hypothesis test is left-tailed, right-tailed, or two-tailed.
Suppose 10 balls, numbered 1-10, are to be distributed randomly into 10 boxes. a) What is the probability all 10 balls are placed into one box? b) What is the probability that no boxes are empty?
What is the probability of her making 97 or more free throws in 118 trials? Round your standard normal variable to two decimal places before using the table of values?
Find the probability that for a randomly selected office hour, the number of student arrivals is 3. (b) What is the probability that he will get at most 5 students in a randomly selected office hour?
What is the probability that a randomly selected student will have a score of 80 or higher? If there were 97,680 students with scores higher than 91, how many students took the test?
Suppose you estimate a regression model to predict weekly expenditures on food per person. Would you be pleased if your model estimate a Standard Error =$300 EXPLAIN?
If the monthly demand for videos on average is 180 and standard deviation = 60, what is the number of videos the manager should order to meet 90% customer demand?
Probability using normal distribution.Sampling distributions. Given a normal distribution with μ = 50 and standard deviation σ = 9, if a sample of n = 100 is selected.
After performing a two sample t-test, you see a p-value of 0.0355. Of the following, which is the appropriate conclusion?
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