Which is an accurate comparison?
How might the graph be misleading?
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 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 ?
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% 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
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?
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?
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
Which set of population data is the least dispersed from its mean?
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 ?
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?
Kavita has been assigned the task of studying the average customer receipt for a branch of a major restaurant chain. The average receipt for the chain is $72.00 with a standard deviation of $11.00. The branch she is studying has an average bill of $67.00 for the last 40 receipts. She needs to know if this falls below the chain’s average. She will use a 1% level for significance because she does not want to inadvertently report the restaurants income as below average. Upper-Tail Values A 5 percent 2 point 5 percent 1% Critical z -v alues 1 point 6 5 1 point 9 6 2 point 5 8 Which choice depicts the result for Kavita’s hypothesis test?
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?
Laila guesses on all 20 questions of a multiple-choice test. Each question has 4 answer choices. What is the probability of a success and a failure for this experiment?
Vladimir rolls a six-sided number cube 36 times. If getting a 3 is a success, what is the probability of a success?
Weston completed a hypothesis test and found that he could not reject the null hypothesis. Which of the following is a valid reason for his conclusion?
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?
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