Example 5.6.4 The mean and standard diviation of the I.Q. (Intelligence quotient) of a group of 500 children is 90 and 20 respectively. Assuming that the I.Q. is normally distributed, find the number of children with I.Q. 2 100. Se-in dx = 0.308 V2n Given that 8. 1 0.5

5. The following values are the number of customers a restaurant served for lunch on ten consecutive days. 46 49 51 60 63 64 72 81 53 65 Find the mean and standard deviation of these data. logy

Which of the following statements is not true?     There is only one median for each variable.     One definition of the median states that, for an odd number of observations, the median is the middle score when scores are placed in order of magnitude.     Another term for the median is 50th percentile.     The median is generally more sensitive to (i.e., affected by) the presence of a few extreme observations than is the mean.

Calculate the z-value for a mean for the following p̂= 0.250p0 = 0.350n = 10

The following table presents the time taken to review articles that were submitted for publication to a particular journal during a recent year. A few articles took longer than  6 months to review; these are omitted from the table. Consider the data to be a population. Time (Months) Number of Articles −00.9 45 −1.01.9 18 −2.02.9 16 −3.03.9 17 −4.04.9 12 −5.05.9 13     (a) Approximate the variance of the times. Round the answer to at least two decimal places. The variance is    .(b) Approximate the standard deviation of the times. Round the answer to at least two decimal places.The standard deviation is    .

The independent variable in either a before/after t or a within subjects F is always of what data scale

the mean = 146, and s =  35 Question #4 A score of 181 is how many z-scores above the mean?

Section 9.2 Homework Progress saved Done 80 8 √ ❤ ⠀ Score: 6/13 7/13 answered 35 Question 8 0/1 pt 3 2 Details In a survey, 22 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $39.2 and standard deviation of $2.9. Estimate how much a typical parent would spend on their child's birthday gift (use a 90% confidence level). Give your answers to 3 decimal places. Express your answer in the format of E. Submit Question 13

21 d-f

Send data to Excel Observed frequency fo Expected frequency ƒE 2 (fo-fe) ƒE Winter Spring Summer 35 1 ☐ 23 37.50 5.607 44 37.50 Fall 48 П 1.127 1 Total 150 X