A student learns that on his most recent exam in psychology, the sample mean was 72.19 with a standard deviation of 14.38. He scored 81. If we assume that this is a population, and it is normally distributed, what proportion of students in the class scored better that this student? What proportion scored lower?

If the mean of the data 4, 6, 8, 5, 7, 10, 9 is 7, what is its standard deviation?     A. 6.50   B. 10.00   C. 3.16

Suppose that Jett achieves a score of 1250 on the SAT, and his sister Kate scores 29 on the ACT. The SAT scores are normally distributed with a mean of 1100 and standard deviation of 250. The ACT scores are normally distributed with a mean of about 20 and standard deviation of 5. Who did better, relative to their peers?

You hypothesize that people in stats classes are happier than people in all other classes. You compare happiness scores in three of your classes: Statistics, Developmental Psychology, and Social Psychology. In Statistics there are 15 students and the mean happiness rating is  23.1 with a standard deviation of 9.78. In Developmental Psychology there are 15 students and the mean happiness rating is 24.4 with a standard deviation of 2.92. In Social Psychology there are 15 students with a mean rating of 17.7 and  standard deviation of 8.46. The sum of squares between groups is equal to 384. The sum of squares within groups is equal to 2461.  Use the One-Way ANOVA calculation table to help calculate. What is the degrees of freedom between samples?

The college physical education department offered an advanced first aid course last summer. The scores on the comprehensive final exam were normally distributed, and the z-scores for some of the students are shown below. Robert 1.05 Juan 1.51 Haley −1.95 Joel 0.00 Jan −0.67 Linda 1.57 (a) If the mean score was ? = 151 with standard deviation ? = 16, what was the final exam score for each student?

You hypothesize that people in stats classes are happier than people in all other classes. You compare happiness scores in three of your classes: Statistics, Developmental Psychology, and Social Psychology. In Statistics there are 15 students and the mean happiness rating is  23.1 with a standard deviation of 9.78. In Developmental Psychology there are 15 students and the mean happiness rating is 24.4 with a standard deviation of 2.92. In Social Psychology there are 15 students with a mean rating of 17.7 and  standard deviation of 8.46. The sum of squares between groups is equal to 384. The sum of squares within groups is equal to 2461.  Use the One-Way ANOVA calculation table to help calculate. What is the degrees of freedom within samples?

Consider the data from the Anthropology 105 class.  The mean for women is 64.33 in and the standard deviation is 2.64 in. The average height of men in the US is approximately 5ft 10in. What proportion of women represented here are shorter than the average man?

John finds that there is a scholarship available to all persons scoring in the top 5 % on the ACT test. If the mean score on the ACT is 21 with a standard deviation of 4.7, what score does he need in order to qualify for the scholarship?

A sample of 281 Al products sold at The Yes Buy located at Finch and Keele has a mean of $74.83 and a median of $68.88. Later, it was discovered that an observation which was recorded incorrectly as "$90.25" but the actual value should be "$95.75". If we make this correction to the data, then what is the sample mean, median, mode and standard deviation?

The length of time it takes for a worker to perform certain task (in minutes) was recorded for 10 workers. The resulting data values were the following: 5, 3, 11, 7, 6, 9, 4, 8, 7, 10 Find the mean, median, mode, range, variance and standard deviation. In the answers for the mean, variance, and standard deviation leave one digit after decimal point. a. Mean = d. Range = b. Median = e. Variance = c. Mode = f. Standard deviation =