Drawing a cumulative frequency polygon, which statement cannot be true? a) The polygon can have upward sloping line segments b) The corners of the polygon are at the midpoint of data class intervals c) The polygon can have downward sloping line segments d) Points show the total number of observed values less than the maximum of the class interval
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Drawing a cumulative frequency
a) The polygon can have upward sloping line segments
b) The corners of the polygon are at the midpoint of data class intervals
c) The polygon can have downward sloping line segments
d) Points show the total number of observed values less than the maximum of the class interval
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- What is a sample space?The probability of making at least one type I error across a set of comparison is referred to as ______. Group of answer choices total error unpredicted error explained error familywise errorThe scale characterized by the classification of events, objects, or persons into mutually exclusive categories and whose only mathematical relationship are those of equivalence and nonequivalence is called:
- A market researcher plans to conduct a satisfaction survey where she selects sample units by means of stratified random sampling. She divides the population into five categories or strata with sizes 600, 200, 400, 500, and 300. If a sample equal to 20% of thepopulation size is to be drawn using equal allocation, what should be the sizes of the sample to be drawn from each stratum?A. n1 = 90, n2 = 60, n3 = 90, n4 = 90, n5 = 70B. n1 = 100, n2 = 100, n3 = 100, n4 = 100, n5 = 100C. n1 = 100, n2 = 40, n3 = 80, n4 = 120, n5 = 60D. n1 = 80, n2 = 80, n3 = 80, n4 = 80, n5 = 80A dendritic tree is a branched structure that emanates from the body of a nerve cell. As part of a study of brain development, 36 nerve cells were taken from the brains of newborn guinea pigs. The investigators counted the number of dendritic branch segments emanating from each nerve cell. The numbers were as follows: 7 30 54 28 31 29 34 35 30 27 21 43 51 35 51 49 35 24 26 29 21 29 37 27 28 33 33 23 37 27 40 48 141 20 30 57 What percent of the observations are within? a) 1 SD of the mean?b) 2 SDs of the mean?c) 3 SDs of the mean? d) Draw the boxplot (modified)Use the Venn diagram below to find the number of elements in the region
- In a survey of 320 test takers, 60 students used both techniques to relax, 200 students used deep breathing, and 25 students used only visualization. a. Complete the Venn diagram by including the correct number in each region. V = the test takers that used visualization B = the test takers that used deep breathing In the diagram above, how many students are in region 1? In the diagram above, how many students are in region 2? In the diagram above, how many students are in region 3? In the diagram above, how many students are in region 4? b. Use the Venn diagram to answer the following questions. How many test takers did not visualize nor deep breathe to relax? How many test takers used visualization to relax? How many test takers did not use visualization for relaxing? How many students did use visualization or use deep breathing to relax while testing?uman blood is classified by the presence or absence of three main antigens (A, B, and Rh). When a blood specimen is typed, the presence of the A and/or B antigen is indicated by listing the letter A and/or the letter B. If neither the A nor the B antigen is present, the letter O is used. The following table gives the percent of a certain country's population having each of the eight possible blood types in the sample space. Note that the presence or absence of the Rh antigen is indicated by the symbols + or −, respectively. Blood Types A+ A− B+ B− AB+ AB− O+ O− Percent 35.9 6.1 9.5 2.5 3.2 0.8 37.2 4.8 (a) What is the probability that a person selected randomly from the population has a blood type that is type O or Rh+? (b) What is the probability that a person selected randomly from the population has a blood type that contains the A antigen? (c) What is the probability that a person selected randomly from the population has a blood type that is type AB or Rh−?construct a group frequency table, show computation on how to arrived in each value c. % Relative Frequency d. Cumulative frequency e. % Cumulative Frequency
- A market researcher plans to conduct a satisfaction survey where she selects sample units by means of stratified random sampling. She divides the population into five categories or strata with sizes 600, 200, 400, 500, and 300. If a sample equal to 20% of the population size is to be drawn using equal allocation, what should be the sizes of the sample to be drawn from each stratum A. ?1 = 90, ?2 = 60, ?3 = 90, ?4 = 90, ?5 = 70B. ?1 = 100, ?2 = 100, ?3 = 100, ?4 = 100, ?5 = 100C. ?1 = 100, ?2 = 40, ?3 = 80, ?4 = 120, ?5 = 60D. ?1 = 80, ?2 = 80, ?3 = 80, ?4 = 80, ?5 = 80The U.S. Department of Agriculture publishes information about U.S. farms in Census of Agriculture. A joint frequency distribution for number of farms, by acreage and tenure of operator, is provided in the following contingency table. Frequencies are in thousands. (a) How many full-owners own under 50 acres? (Enter a whole number only) (b) How many part-owners own 180 to under 500 acres? (Enter a whole number only) (c) How many tenants own 180 to under 500 acres? (Enter a whole number only)