N

Mean

efficiency

Std. deviation

Std. error

95% Confidence interval for mean

Min.

Max.

Lower bound

Upper bound

No-baffles

10

29.00

1.93129

0.61073

27.5084

30.2716

28.20

30.40

2-baffles

7

29.214

1.91349

0.72323

27.4446

30.9840

29.10

31.70

3-baffles

10

31.290

2.34400

0.74124

29.6132

32.9668

29.80

34.80

4-baffles

10

33.140

2.67798

0.84685

31.2243

35.0557

30.30

38.70

8-baffles

3

33.700

3.77227

2.17792

24.3292

43.0708

30.60

37.90

Total

40

30.970

2.92340

0.46223

30.0351

31.9049

26.10

38.70

Model

Fixed effects

2.37842

0.37606

30.2066

31.7334

Random effects

0.97645

28.2589

33.6811