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Overtime occurs after eight hours of work on a given day. What is the probability that the letter carrier works overtime on any given day? What is the probability that the route will be completed w
The data below are the temperatures on randomly chosen days during a summer class and the number of absences on those days. Construct a 95% confidence interval about the mean value of y, the number
She randomly samples 67 CFOs and finds that 40 of them get their money news from newspapers. Does the test show enough evidence to reject the findings of Robert Half International? Use a = .05.
A statistics professor plans his classes so carefully that the lengths of his classes are uniformly distributed between 45.0 and 55.0 minutes. Find the probability that a given class period run less
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim? Use a 1% level of significance.
They want to be 90% confident of their results and want the error of the interval estimate to be no more than $100. They estimate that such bills range from $600 to $2,500. How large a sample should
If 3 of the 98 test subjects are randomly selected without replacement, find the probability that they all had false positive results. Is it unusual to randomly select 3 subjects without replacement
Compute Cohen's d to measure the size of the preschool effect. Write a sentence showing how the outcome of the hypothesis test and the measure of effect size would appear in a research report.
what is the lowest score you can get and still be eligible for employment? B) what percent of the exam-takers scored between 76 and 86 on the exam? C) find the x-score interval that contains the mid
Determine how many participants recovered at the end of posttreatment and use a chi-square analysis to compare recovery rates across the three treatments at both posttreatment and follow-up.
According to an IRS study, it takes a mean of 330 minutes for taxpayers to prepare, copy and electronically file a 1040 tax form. What is the standard error of the mean in this example ?
The average age for a person getting married for the first time is 26 years (U.S. News and World Report, June 6, 1994). Assume the ages for first marriages have a normal distribution with a standard
CRA CDs Inc. wants the mean lengths of the " cuts " on a CD to be 135 seconds (2 minutes and 15 seconds). What is the standard error of the mean?
sample of 3000 observations has a mean of 85, stand.dev. of 19.distribution is bell shaped. whats the percentage for observations fall in intervals 1s, 2s, 3s,
The Pennsylvania Refining Company is studying the relationship between the pump price of gasoline and the number of gallons sold. For a sample of 14 stations last Tuesday, the correlation was 0.83.
Scores ranged from 0 to 40 with higher scores reflecting greater computer anxiety. This variable was measured on the interval scale. The researcher analyzed the data using what t test?
A contractor is considering a sale that promises a profit of $24,000 with a probability of .7 or a loss (due to bad weather, strikes, and such) of $8000 with a probability of .3. What is the expecte
The equation y=350-2.5x is used to predict quarterly demand where x = 0 in the second quarter of last year. Quarterly seasonal factors are Q1=1.5, Q2=0.8, Q3=1.1, Q4=0.6. What is the forecast for th
We want to relate the indices to blood-pressure level.Provide a scatter plot relating mean SBP and mean DBP, respectively, to each of the salt-taste and sugar-taste indices.Does there appear to be
What is the probability that between 133 and 171 of the business travelers say that the reason for their most recent business trip was an internal company visit.
Fifty six percent of the employees in a company have managerial positions, and 59 percent of the employees in the company have MBA degrees. Also, 37 percent of the managers have MBA degrees. Using
According to a report by Scarborough Research, the average monthly household cellular phone bill is $73. What is the probability that a randomly selected monthly cell phone bill is more than $100?
What is the probability that the person thinks that "Made in America" ads boost sales given that the person does not use social media online?
The scores on a certain test are "normally distributed with mean 61" and "standard deviation 3". What is the probability that a sample of 100 students will have a mean score of at least 61.3?
A mean o f $415,953. Assume that s = $463,364. Find the best point estimate of the mean salary of all NCAA football coaches.