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Dovator [93]
3 years ago
14

A statistics teacher taught a large introductory statistics class, with 500 students having enrolled over many years. The mean s

core over all those students on the first midterm was ????=78 with standard deviation ????=10 . One year, the teacher taught a much smaller class of only 25 students. The teacher wanted to know if teaching a smaller class was more effective and students performed better. We can consider the small class as an SRS of the students who took the large class over the years. The average midterm score was x¯=83 . The hypothesis should be:
Mathematics
1 answer:
Vikki [24]3 years ago
4 0

Answer:

Step-by-step explanation:

Given that a statistics teacher taught a large introductory statistics class, with 500 students having enrolled over many years.

Mean = 78 and std dev =10

Next time, sample size n was reduced to 25

For smaller sample size the mean was found to be = 83

The teacher wanted to know if teaching a smaller class was more effective and students performed better

ie comparison of two means of two samples should be done with different sample sizes but same teacher.

Hence hypothesis should be:

H_0: \bar x =\bar y\\H_a : \bar x

where x denotes the I sample and Y the second with 25 students.

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Rashid [163]
The average daily cost is $7.02.
 
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+7.00
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7 0
3 years ago
Dan buys a car for £2100.
SVETLANKA909090 [29]

Answer:

£1837.5

Step-by-step explanation:

Given data

Cost of car P=  £2100.

Rate r= 2.2%

Time t= 6 years

Now we want to find the  worth after 6 years, let us apply the compound interest expression but this time for depreciation

A= P(1-r)^t

Substitute

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8 0
3 years ago
Identify the 35th term of an arithmetic sequence where a1 = −7 and a18 = 95.
borishaifa [10]
Th term of an arithmetic sequence:

We have to find the difference (d)

an=a₁+(n-1)d

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a₁=-7
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95=-7+(18-1)d
95+7=17d
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d=102/17
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Now, we can calculate the 35 th term of an arithmetic sequence:
a₃₅=-7+(35-1)*6
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Answer: the 35th term of this arithmetic sequence is 197. (a₃₅=197)

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How to find surface area of prisms
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Answer:

Step-by-step explanation:

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