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Musya8 [376]
2 years ago
14

12 Over a period of several years in a sleep-therapy clinic, the average latency to fall asleep for adult males, age 20-30, has

been found to be 335 seconds. In a study of the effectiveness of hypnotic therapy, 30 males of the appropriate age are given the treatment and then their latency to fall asleep is measured.
The results are a mean latency of 283.7, with a variance of 5,756.26 seconds. Test the hypothesis that hypnotic therapy has no effect on sleep latency. Use an a level of .05 and a nondirectional test.
Mathematics
1 answer:
Volgvan2 years ago
8 0

Answer:

gsgshzbshdbbdbfnsjjncnsnfndnebfndbfndnbvndnenjdjfnxjrjcndjfjcnndjfndjejfjekfjndnfjdndnfjdncjcnndnxbvndncbcjfnfxnndsnsnfcn

xnbdjendnfjnxnrnxzkksvixibdbwbkchfjenz

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If the length of minute hand of a clock is 42m . How much distance minute hand will cover in 15 minutes ?
Reil [10]

Answer: We minutes hand moves for 20minutes ,it makes 120° central angle

Length=x/360×2πr

=120/360×2×22/7×42

On simplyfing

Length=88cm

Step-by-step explanation:

4 0
2 years ago
What is -a'if a=-5?​
marta [7]
A’ is 5. Just multiply -5 by -1 to get 5.
8 0
3 years ago
17) Solve the system as matrix equations using inverses. 17) A company produces three models of MP3 players, models A, B, and C.
Vinvika [58]

Answer:

Model A=30, Model B: 20, Model C: 45

Step-by-step explanation:

Let x be the amount of type A mp3 produced, and the amount of model B mp3's produced and z the amount of model C mp3 produced.

Since in total there are 303 hours for electronics work, then:

3.2x+5.4y+2.2z=303

Since in total there are 393 hours for assembly, then:

2.8x+2.4y+5.8z=393

Since in total there are 416 hours for quality assurance, then:

4.4x+3.4y+4.8z=416

Then, the linear system associated to the problem is

3.2x+5.4y+2.2z=303\\2.8x+2.4y+5.8z=393\\4.4x+3.4y+4.8z=416

with coefficient matrix A=\left[\begin{array}{ccc}3.2&5.4&2.2\\2.8&2.4&5.8\\4.4&3.4&4.8\end{array}\right] and vector of constant terms b=\left[\begin{array}{ccc}303\\393\\416\end{array}\right]

Since the determinant of A is equal to 36.704 then A is invertible.

Then for solve the system Ax=b, is enough find the inverse of A and operate

Ax=b\\A^{-1}Ax=A^{-1}b\\x=A^{-1}b

Using Octave we obtain that

A^{-1}=\left[\begin{array}{ccc}-0.22&-0.50 &0.71\\0.33&0.15&-0.34\\-0.028& 0.35&-0.20\end{array}\right]

Then

x=A^{-1}b=\left[\begin{array}{ccc}30\\20\\45\end{array}\right]

This means that 30 mp3's of model A, 20 of model B and 45 of model C must be produced

8 0
3 years ago
Name the property of equality that justifies the statement: rs = rs
harkovskaia [24]
A. reflexive property
hope it helps.
6 0
3 years ago
Read 2 more answers
Clare is painting some doors that are all the same size. She used 2 liters of paint to cover 1 3/5 doors. How many liters of pai
barxatty [35]

Answer:

1\frac{1}{4}\ liters

Step-by-step explanation:

step 1

Convert mixed number to an improper fraction

1\frac{3}{5}=\frac{1*5+3}{5}=\frac{8}{5}

step 2

Using proportion

\frac{2}{(8/5)}\frac{liters}{doors} =\frac{x}{1}\frac{liters}{door}\\ \\x=2/(8/5)\\ \\x=10/8\ liters

step 3

Convert to mixed number

\frac{10}{8}\ liters=\frac{8}{8}+\frac{2}{8}=1\frac{1}{4}\ liters

8 0
3 years ago
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