)At the beginning of an experiment, the birth weights of 60 Rattus norvegicus (laboratory rats) were measured. After the measurements were recorded, it was discovered that the scale was not accurately calibrated. The birth weights were adjusted to account for the incorrect measurements by adding 0.2 grams to each of the 60 weights. Which of the following statis-tics, calculated from the weights of the 60 lab rats, has the same value before and after the adjustment? I. The first quartile (Q]) II. The third quartile (3) III. The interquartile range (IQR) (A) I only (B) II only (C) III only (D) I and II (E) I, II and III

Calculate the mean, variance, standard deviation and standard error of the birth weights of ten albino ratsgiven below:15, 24, 12, 8, 28, 21, 12, 16, 20, 19Answers ????????????????????????

Q 1: A student is finding the weight of a metre rule using the apparatus shown in Figure 1. Figure 1 (not to scale)  He places the load P = 1.00 N on the metre rule at the 5.0 cm mark.  He places the metre rule on the pivot at the 45.0 cm mark.  He places load Q = 0.80 N on the rule and adjusts its position so that the metre rule is as near as possible to being balanced. He measures  the distance x (between the centre of load P and the pivot)  the distance y (between the centre of load Q to the pivot) He repeats the procedure, placing the load P at the 10.0 cm mark, at the 15.0 cm mark, at the 20.0 cm mark and at the 25.0 cm mark. The readings are shown in Table. Table 1 x ( ) y ( ) A = P x ( ) B = Q y ( ) 40.0 42.5 35.0 36.0 30.0 30.0 25.0 24.0 20.0 17.5 (i) In the table 1: (a) Complete the column headings/units. [1 ] 5 (b) Complete the column A = P x. [1] (c) Complete the column B = Q y. [1] (ii) Plot a graph of A (y-axis) against B (x-axis). Start both axes at the origin (0,0). [1 ] (iii) Using the graph, determine the vertical intercept Y (the value of A, when B = 0 N cm). Show clearly on the graph how you obtained this value. Y = [1] (iv) Calculate the weight W of the metre rule using the equation W = Y/z , where z = 5.0 cm. W = [1] 6 (v) Suggest one practical reason why it is difficult to obtain exact results with this experiment. [1] (vi) The student uses an accurate electronic balance to obtain a second value for the weight of the metre rule. weight obtained on the balance = 1.24 N State and justify whether the two values for the weight agree within the limits of experimental accuracy. Statement [1 ] Justification [1 ]

Select all the correct answers.The local animal shelter has two dog sections: A and B. Tristan weighed all of the dogs in each section and recorded their weights, in pounds, below.Section A   Section B11 20 1530 56 593 28 2124 9 6153 19 37  37 46 5121 27 1833 41 4944 29 3531 36 32Which of the following statements are true about this data? The weights of the dogs in section B are generally more spread out. The dogs in section A are generally heavier.  The dogs in section B are generally heavier.  The weights of the dogs in section A are generally more spread out.

What does the first quartile (Q1) represent?a.The value below which 50% of the data fallsb.The value below which 25% of the data fallsc.The value above which 50% of the data fallsd.The value above which 25% of the data falls

What is the value of the first quartile for observations 15, 18, 10, 20, 23, 28, 12, 16?(a) 17 (b) 16 (c) 12.75 (d) 12