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Table 1 Study sample sizes for general questionnaire survey

From: The study of the possibility of switching driving side in Rwanda

Vehicle Type

Total Population

Population (50 %) in Study Area

Proportion of respondents who can answer correctly

SE

D Value (95 % CL)

Minimum Sample Size Required

Study Sample size

Bus

241

121

0.95

0.05

0.000651

46

160

Truck

2,193

1,097

0.95

0.05

0.000651

68

61

Pickup

9,958

4,979

0.95

0.05

0.000651

72

117

Trailer Truck

619

310

0.95

0.05

0.000651

59

75

Jeep

8,696

4,348

0.95

0.05

0.000651

72

158

Minibus

4,284

2,142

0.95

0.05

0.000651

71

263

Car

14,154

7,077

0.95

0.05

0.000651

72

187

Articulated Truck

127

64

0.95

0.05

0.000651

34

47

Total

40,272

20,136

0.95

0.05

0.000651

494

1,068