What is the corresponding z-score for x = 7?Ī random sample of 8 manufacturing companies is selected from a population of manufacturing companies. 1.2 Group the data into a frequency distributĪ random variable X has a mean of 4 and a standard deviation of 2. The number of aces served by Novak Djokovic in the last 20 tournaments that he has participated in is shown below. A random sample of 16 students took the typing test, and we obtained an average speed of 62 words per minute with a standard deviation of 8. determine the linear regression equation.Ī professor in a typing class found out that the average performance of an expert typist is 85 words per minute. calculate the Pearson's correlation coefficient. draw a scatter diagram depicting the data. The raw data presented here are the scores (out of 100 marks) of a market survey regarding the acceptability of a new product launched by a company for a random sample of 50 respondents: 40 45 41 45 45 30 30 8 48 25 26 9 23 24 26 29 8 40 41 42 39 35 18 25 Draw an Ogive curve corresponding to the data and use i Determine the mean, median, and mode using the raw data. 1 Group the data into a grouped distribution using six classes of equal width. Examine the data using groups and presenting: a) the Histogram of the absolĭataset: 35 22 18 54 22 46 28 31 43 22 14 17 25 19 33 14. The last value will always equal the total for all observations since the calculator will have already added all frequencies to the previous total.Ī sample of 10 randomly selected students revealed the following grades in Business Statistics first test (in a marking scale of 0 to 100): 79, 63, 60, 45, 55, 58, 59, 62, 40, 68. The cumulative frequency is calculated by adding each frequency from a frequency distribution table to the sum of its predecessors. For example:į: 5 10 15 How to enter grouped data?Grouped data are formed by aggregating individual data into groups so that a frequency distribution of these groups serves as a convenient means of summarizing or analyzing the data.į: 5 10 15 How to enter data as a cumulative frequency table?Similar to a frequency table, but instead, f: write cf: in the second line. Each element must have a defined frequency that counts numbers before and after symbol f: must be equal. Write data elements (separated by spaces or commas, etc.), then write f: and further write the frequency of each data item. How to enter data as a frequency table?Simple.
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