Which letter represents the approximate location of the mean number of math classes?
A utility company hires pollsters to knock on random doors in different parts of town to survey residents about the cost of their electric bill. Would this study be biased? Why or why not?
A normal distribution of data has a mean of 90 and a standard deviation of 18 What is the approximate z -score for the value 64 ?
The set of life spans of an appliance is normally distributed with a mean mu is equal to 48 months and a standard deviation sigma is equal to 8 months. What is the life span of an appliance that has a z -score of negative 3 ?
The president of the math club is conducting a survey to see where the twelfth-grade class wants to go on their field trip. Instead of asking the whole class, she surveys only the twelfth-grade members of the math club. She records their choices and plans to present the results to the school principal. What type of sampling did she use?
A simple random sample of 85 is drawn from a normally distributed population, and the mean is found to be 146 , with a standard deviation of 34 Which of the following values is outside the 99 percent confidence interval for the population mean? Use the table to help you answer the question. Confidence Level 90 percent 95 percent 99 percent z to the ast th power -score 1 point 6 4 5 1 point 9 6 2 point 5 8 Remember, the margin of error, ME , can be determined using the formula ME is equal to the fraction with numerator z times s and denominator square root of n
Which set of population data is the least dispersed from its mean?
A trade school would like to measure the long-term success of its graduates after they leave the school, and emails a survey requesting information from graduates about their work experience. One question asks graduates if they are currently employed in the field they studied in school, while another asks them to share their annual salary. What type of bias is most likely to be present in the survey results?
What proportion of families own as opposed to rent their home? To find out, an urban planner selected a random sample of 400 families in a large city to participate in a survey about homeownership. Of the 362 families that responded to the survey, 42 percent reported that they own their home. Which of the following statements about the survey results is true?
Veronique has a spinner with three sections of equal size, red r , green g , and blue b The spinner is spun twice. The sample space for the possible outcomes is cap s is equal to rr, rb, rg, gr, gg, gb, br, bg, bb If the number of times red is spun is the random variable, cap x , which graph represents the probability distribution?
Opal is collecting data on water levels in different parts of town. She notices that her sample data has a low-value outlier. Which statement must be true?
The grades of a science test are normally distributed. Thanh finds that his grade on the test has a z -score of negative 2 point 5 Which statement must be true?
When finding the margin of error for the mean of a normally distributed population from a sample, what is alpha , assuming a confidence level of 74 percent ?
The number of absences for one week for all students at a high school were compiled, and the probability distribution was created. What is the probability in any given week that a randomly selected student will be absent no more than one day? Probability Distribution Days Absent: cap x Probability: cap p times cap x 0 0 point 7 8 1 0 point 1 4 2 0 point 0 3 3 0 point 0 1 4 0 5 0 point 0 4
The lowest possible passing grade on the test was a 54 out of 90 What percentage of students passed this test?
What is the shape of the distribution of bag weight?
Which of the following is a true statement based on the histogram?
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