21. Based on anecdotal evidence (i.e., nonrandom, small samples), some have hypothesized that IQ has actually improved among recent birth cohorts. When a particular IQ test was validated in the 1950s, the mean was 100, with a standard deviation of 15. Suppose I hypothesize that IQ now has a mean of 110 (but with a standard deviation still of 15). I take a random sample of 20 persons and find r = 105 What can I say about my hypothesis?

Q: 国 7.

A: Solve for a

Q: how many integers from 1 to 1000 are multiples of 3 or 5 (or both)

A: We want to find number of integer from 1 to 1000 are multiples of 3 or 5 (or both)

Q: In an apartment complex with 11 mailboxes in how many ways can a mail carrier distribute 11 letters…

A: Consider the given information.

Q: Diagonalize the following matrix. The real eigenvalues are given to the right of the matrix. 30-3 1…

A: The given matrix is                                 A=30-3143004  and its eigen values are  λ=3,4

Q: 5.78+9.1

A: We have given that,  5.78+9.1 We will find the addition of the given values?

Q: 41 21°

A: As we know that  sin(θ)=opposite hypotanuse

Q: x)

A:

Q: 3. V(3437)3 + 10215

A:

Q: 40 X

A:

Q: 10 + 2/4 = O 20 O 5 O 10

A:

Q: 5. 110 (x + 12)°

A: given alternate exterior angles are equal.

Q: 198-33

A: Given: 198-33

Q: 1805

A:

Q: 74.1 6.

A:

Q: 62 28

A: A circle is given below as shown We have to find x°

Q: 16 I 25 3/5

A:

Q: 0.1092 + 0.21

A:

Q: 6   9,171.6

A:

Q: 81 (1) 420

A:

Q: 1 1 +. ..+ 6"-1 1+ +.... 36 +

A: we have to find sum of given expression This is infinite geometry series with ratio 1/6 and first…

Q: 7 to the power of 18

A: To determine: 7 to the power of 18

Q: Variable Y 24 20 16+ 12 8 A (3) 0 2 6 8 10 12 14 16 18 Variable X The slope of line (2) on the…

A:

Q: Foctors of 18

A: Factorization of the number is obtained by the writing the number as the product of prime numbers A…

Q: 3. Select the equivalent expression. * OA. 1 8-22 O B. 26 89 o20 Tr

A: use the property of exponents

Q: 86 10. 24 abe 2:4:3 9.

A: Answer 9 but given information in question 10 is incorrect

Q: 20 Σ 36"

A:

Q: 8. 2 k=1 3k

A:

Q: 60 6 30 V3/2

A: Topic:- trigonometry ratios

Q: Sy 121

A: Given,         25y2 = 121

Q: 2322

A: Explanation and solutions is given below....

Q: {n fan c) (wp

A:

Q: 6. 3 (2s+5)³

A:

Q: | = +x 6.

A:

Q: 4 ) V8

A:

Q: 57° 48 33

A:

Q: 9.2 q 10

A: We use  Sin(a+b) = sin(a)cos(b) + cos(a) sin(b)  Pythagoras theorem (Hypotenuse)2 =…

Q: 42 of

A: Here, we need to find the value of x.

Q: 9. 6100 318 + 8 8

A: Given that 68+38 Find the value of 68+38

Q: 2dt 12 18 O 14 20

A: We have to solve the integration.

Q: 225 x 45= %|

A:

Q: 2040

A: